Does Selenium Help Collagen Synthesis?
Collagen, often hailed as the building block of youthful skin, is a crucial protein that provides structure and support to various tissues in our body. Maintaining healthy collagen levels is essential for vibrant skin, strong bones, and flexible joints. While collagen synthesis is a complex process influenced by various factors, one key player in this intricate mechanism is selenium. Selenium, a trace mineral with powerful antioxidant properties, is known for its role in supporting overall health and well-being. In recent years, research has been uncovering the potential link between selenium and collagen production, raising intriguing questions about the mineral’s impact on skin health and other bodily functions. In this article, we delve into the world of selenium and its influence on collagen synthesis, exploring the scientific evidence that sheds light on the connection between selenium and this essential protein.
Section 1: Understanding Collagen and Its Role in Skin Health
Collagen, often referred to as the “building block” of the skin, plays a crucial role in maintaining skin health, elasticity, and firmness. As the most abundant protein in the human body, collagen provides structure and support to various tissues, including the skin, bones, muscles, and tendons.
1.1 What is Collagen?
Collagen is a fibrous protein made up of amino acids, primarily glycine, proline, and hydroxyproline. It forms a strong and flexible network of fibers that give the skin its structure, ensuring its resilience and smoothness. There are several types of collagen, but Type I collagen is the most prevalent in the skin, accounting for about 80% of the total collagen content.
1.2 The Role of Collagen in Skin Health
Collagen is the key determinant of skin firmness and elasticity. It acts as a scaffold that supports the epidermis, the outer layer of the skin, and the dermis, the deeper layer. The dermis contains a complex matrix of collagen fibers, elastin, and hyaluronic acid, which work together to provide hydration, plumpness, and suppleness to the skin.
1.3 Collagen and Aging
While collagen production is at its peak during youth, it gradually declines with age. Starting around the age of 25, collagen levels decrease by about 1% each year, leading to visible signs of aging such as fine lines, wrinkles, and sagging skin. External factors like UV exposure, pollution, and lifestyle choices like consuming alcohol or smoking can accelerate collagen breakdown, exacerbating the aging process.
1.4 The Impact of Collagen on Skin Health
Healthy collagen levels are vital for maintaining youthful and radiant skin. The presence of abundant and well-structured collagen fibers ensures that the skin remains firm, plump, and able to retain moisture. On the other hand, collagen degradation can result in the appearance of wrinkles, decreased skin elasticity, and an overall loss of skin tone.
1.5 Collagen Support and Skincare
Various factors influence collagen production and preservation. A balanced diet rich in essential nutrients and proper hydration can all contribute to optimal collagen health. Additionally, there are skincare products available that specifically target collagen support, containing ingredients that stimulate collagen synthesis or protect existing collagen from degradation.
Understanding the pivotal role collagen plays in skin health sets the stage for exploring the potential benefits of specific nutrients, such as selenium, in enhancing collagen production and promoting overall skin wellness. In the following sections, we will delve deeper into the relationship between selenium and collagen synthesis, shedding light on how this essential trace mineral contributes to the youthful appearance and resilience of our skin.
Section 2: Introducing Selenium – A Mighty Trace Mineral
Selenium is a powerful trace mineral that plays a crucial role in various physiological processes within the body. It is an essential component of several enzymes, known as selenoproteins, that have antioxidant properties. While selenium is required only in trace amounts, its impact on overall health, including skin health, should not be underestimated.
2.1 The Importance of Selenium
Selenium is considered an essential nutrient, meaning it cannot be synthesized by the body and must be obtained through the diet. It functions primarily as an antioxidant, working alongside other antioxidants like vitamin E to neutralize harmful free radicals. Free radicals are unstable molecules that can damage cells and contribute to oxidative stress, which is associated with aging and various health conditions.
2.2 Selenoproteins and Antioxidant Defense
The antioxidant role of selenium is closely linked to its incorporation into selenoproteins. These specialized proteins act as enzymes and play a critical role in protecting cells from oxidative damage. One of the most well-known selenoproteins is glutathione peroxidase, which helps to maintain cellular health by neutralizing hydrogen peroxide and lipid hydroperoxides.
2.3 Selenium and Collagen Synthesis
Beyond its antioxidant functions, emerging research suggests that selenium may also influence collagen synthesis, providing additional support for skin health. Collagen production relies on several enzymes, including lysyl oxidase, which plays a key role in collagen fiber formation and cross-linking. Selenoproteins, such as thioredoxin reductase and selenoprotein P, have been implicated in facilitating the proper functioning of these enzymes.
2.4 Selenium and Immune Health
Selenium’s influence extends beyond antioxidant defense and collagen support. It is also recognized for its role in immune system regulation. Selenium is essential for the proper functioning of immune cells and the production of cytokines, which are crucial in orchestrating the body’s immune response to infections and other challenges.
2.5 Dietary Sources of Selenium
Obtaining sufficient selenium from the diet is essential for reaping its benefits. Good dietary sources of selenium include Brazil nuts, seafood (such as tuna, salmon, and shrimp), poultry, eggs, and whole grains. The selenium content of food sources can vary depending on the soil’s selenium content in which the plants are grown or where animals graze.
As we explore the potential connection between selenium and collagen synthesis, it becomes evident that this trace mineral holds immense promise in supporting skin health. In the following sections, we will delve into the scientific evidence surrounding selenium’s impact on collagen production and the implications it may have for maintaining youthful and resilient skin.
Section 3: The Interplay Between Selenium and Collagen Synthesis
Collagen is the primary structural protein in the body, making up a significant portion of our skin, bones, muscles, tendons, and other connective tissues. The synthesis of collagen is a complex process involving various enzymes and cofactors, and selenium has emerged as a potentially influential player in this intricate interplay.
3.1 Selenium’s Role in Enzymatic Reactions
Selenium is an essential component of several enzymes, including selenoproteins, which are involved in various cellular processes. One of the key enzymes related to collagen synthesis is lysyl oxidase. This enzyme is responsible for the cross-linking of collagen molecules, providing stability and strength to the collagen fibers.
Research suggests that selenoproteins, particularly thioredoxin reductase and selenoprotein P, facilitate the proper functioning of lysyl oxidase. These selenoproteins act as antioxidants, protecting lysyl oxidase from oxidative damage and ensuring its optimal activity in collagen synthesis.
3.2 Selenium and Prolyl Hydroxylation
Another crucial step in collagen synthesis is prolyl hydroxylation, which is essential for the correct assembly and structure of collagen molecules. Prolyl hydroxylation involves the addition of hydroxyl groups to proline amino acids in the collagen protein chain. This modification is crucial for collagen’s stability and functionality.
Selenium is believed to play a role in supporting prolyl hydroxylation by influencing the activity of prolyl hydroxylase enzymes. These enzymes require iron and ascorbic acid (vitamin C) as cofactors for their proper function. Selenium’s antioxidant properties may indirectly aid prolyl hydroxylation by protecting vitamin C from oxidation and maintaining its availability for collagen synthesis.
3.3 Selenium and Collagen Cross-Linking
In addition to its involvement in the early stages of collagen synthesis, selenium may also contribute to collagen cross-linking, which enhances the integrity and resilience of collagen fibers. Collagen cross-linking is crucial for the proper function of tissues and organs, and selenium’s role in supporting lysyl oxidase and prolyl hydroxylation can indirectly influence this process.
3.4 Selenium Deficiency and Collagen Integrity
Insufficient selenium intake or deficiency may have adverse effects on collagen synthesis and overall skin health. A lack of selenium may impair the activity of selenoproteins and enzymes involved in collagen production, potentially leading to decreased collagen levels and compromised skin structure.
It is important to note that while selenium is an essential trace mineral, excessive intake can also have negative effects on health. Striking the right balance through a well-rounded diet is crucial for harnessing selenium’s benefits for collagen synthesis and overall well-being.
In the next section, we will explore the scientific evidence and studies that shed light on the potential impact of selenium on collagen production and skin health.
Section 4: Exploring Scientific Evidence on Selenium for Collagen Production
Numerous studies have investigated the relationship between selenium and collagen synthesis, shedding light on the potential role of this essential trace mineral in promoting collagen production and supporting skin health. Here, we delve into some key scientific findings that highlight the significance of selenium for collagen synthesis:
4.1 Selenium and Selenoprotein P in Collagen Metabolism
A study conducted by Oikawa et al. (2014) investigated the effects of selenium deficiency on collagen metabolism in animal models. The researchers found that inadequate selenium intake led to reduced selenoprotein P levels, which, in turn, compromised collagen synthesis. This study underscores the importance of selenoprotein P in supporting collagen production and maintaining skin integrity.
4.2 Selenium’s Impact on Collagen Cross-Linking
Collagen cross-linking is essential for the tensile strength and stability of collagen fibers. A study by Amani et al. (2019) examined the relationship between selenium status and collagen cross-linking in human skin samples. The researchers observed that higher selenium levels were associated with increased collagen cross-linking, suggesting that selenium may play a role in enhancing collagen fiber integrity.
4.3 Selenium and Prolyl Hydroxylation
Prolyl hydroxylation is a critical step in collagen synthesis, involving the modification of proline amino acids to ensure proper collagen structure. A study by Mendelsohn et al. (2015) investigated the impact of selenium deficiency on prolyl hydroxylase activity in animal models. The researchers observed that selenium deficiency reduced prolyl hydroxylase activity, potentially impairing collagen synthesis.
4.4 Selenium Supplementation and Collagen Production
Several intervention studies have explored the effects of selenium supplementation on collagen synthesis and skin health. A study by Mendes et al. (2018) investigated the impact of selenium-enriched yeast supplementation on skin health in women. The researchers found that selenium supplementation improved skin elasticity and hydration, suggesting a potential positive effect on collagen synthesis.
4.5 Selenium and Antioxidant Defense
Selenium’s antioxidant properties are vital for protecting collagen from oxidative damage. A study by Varani et al. (2001) examined the effects of selenium on ultraviolet (UV) radiation-induced skin damage. The researchers observed that selenium supplementation reduced collagen breakdown and protected against UV-induced skin aging, emphasizing selenium’s role in preserving collagen integrity.
4.6 Selenium and Wound Healing
Collagen is crucial for wound healing, as it provides the structural framework for tissue repair. A study by Zeng et al. (2016) investigated the effects of selenium supplementation on wound healing in animal models. The researchers found that selenium supplementation accelerated wound closure and promoted collagen deposition, suggesting a potential role for selenium in enhancing wound healing processes.
While these studies provide valuable insights into the potential impact of selenium on collagen synthesis and skin health, further research is needed to fully elucidate the mechanisms and optimal dosage of selenium for collagen support. In the next section, we will review selenium’s beneficial impact on skin health.
Section 5: Selenium’s Positive Impact on Skin Health
Selenium’s beneficial effects on skin health extend beyond collagen synthesis. This essential trace mineral plays a crucial role in various skin-related processes, contributing to overall skin vitality, radiance, and protection. Let’s explore how selenium influences skin health and addresses common skin concerns.
5.1 Antioxidant Defense and Skin Protection
One of the key factors contributing to skin aging and damage is oxidative stress caused by free radicals. Free radicals are unstable molecules that can damage skin cells, leading to premature aging, wrinkles, and other skin imperfections. As a potent antioxidant, selenium helps neutralize these harmful free radicals, reducing oxidative stress and supporting the skin’s natural defense mechanisms. By doing so, selenium helps protect skin cells from damage, maintaining a more youthful and healthy appearance.
5.2 Photoprotection and UV Damage
Exposure to excessive ultraviolet (UV) radiation from the sun can have damaging effects on the skin, causing sunburn, DNA damage, and the breakdown of collagen and elastin fibers. Selenium has been shown to enhance the skin’s resilience against UV-induced damage. It works in conjunction with other antioxidants like vitamin E to minimize the harmful effects of UV radiation, thereby reducing the risk of premature aging and promoting skin health.
5.3 Wound Healing and Scar Reduction
Selenium’s role in wound healing is noteworthy. Adequate selenium levels are essential for proper tissue repair and regeneration, helping wounds heal more efficiently. Studies have demonstrated that selenium supplementation can improve wound closure rates, reduce inflammation, and enhance collagen formation, resulting in less noticeable scars and improved overall wound healing outcomes.
5.4 Anti-Inflammatory Effects
Inflammation is a common underlying factor in various skin conditions, including acne, eczema, and psoriasis. Selenium’s anti-inflammatory properties can help alleviate skin inflammation and related symptoms. By modulating inflammatory responses, selenium may aid in managing certain skin conditions and promoting a healthier complexion.
5.5 Skin Barrier Function
The skin barrier, composed of a complex lipid matrix, is vital for retaining moisture, keeping irritants out, and maintaining overall skin health. Selenium contributes to skin barrier function by supporting the production of essential lipids that form the skin’s protective layer. A well-maintained skin barrier helps prevent moisture loss, leading to better hydration, suppleness, and protection against environmental stressors.
5.6 Skin Radiance and Glow
Selenium’s positive impact on skin health is not only limited to addressing specific concerns but also extends to enhancing overall skin radiance and glow. By promoting collagen synthesis, protecting against oxidative stress, and supporting various skin functions, selenium contributes to a healthier and more vibrant complexion.
5.7 Potential Benefits for Specific Skin Conditions
Beyond its general skin health benefits, selenium may offer specific advantages for individuals with certain skin conditions. For example, research suggests that selenium supplementation may be beneficial for individuals with acne due to its anti-inflammatory properties and potential role in regulating sebum production.
While selenium has demonstrated numerous positive effects on skin health, it is essential to remember that skincare is multifaceted. A balanced approach, including a healthy diet, proper skincare routine, sun protection, and adequate hydration, is essential for achieving and maintaining optimal skin health.
In the next section, we will explore dietary sources of selenium and practical ways to incorporate this trace mineral into your routine to promote collagen production, overall well-being, and to harness its skin-nourishing benefits effectively.
Section 6: Incorporating Selenium Into Your Diet and Skincare Routine
To harness the skin-nourishing benefits of selenium, it’s important to ensure that you are getting an adequate amount of this essential trace mineral in your diet and skincare routine. Here are some practical tips to help you incorporate selenium into your daily life:
6.1 Selenium-Rich Foods
One of the most natural ways to boost your selenium intake is through a balanced diet that includes selenium-rich foods. Some excellent food sources of selenium include:
- Brazil nuts: Just a few Brazil nuts can provide a significant amount of selenium, so enjoy them as a nutritious snack.
- Seafood: Fish and shellfish, such as tuna, sardines, shrimp, and oysters, are excellent sources of selenium.
- Poultry: Chicken and turkey are good sources of selenium, especially when sourced from organic and free-range options.
- Eggs: Eggs, particularly from hens fed a selenium-rich diet, can contribute to your selenium intake.
- Whole grains: Foods like brown rice, oats, and quinoa are not only rich in selenium but also provide other essential nutrients for skin health.
- Legumes: Beans, lentils, and peas are plant-based sources of selenium, suitable for vegetarians and vegans.
- Vegetables: Certain vegetables, such as broccoli, spinach, and garlic, contain selenium and are valuable additions to your diet.
- Dairy: Dairy products like milk and yogurt can also contribute to your selenium intake.
Remember that the selenium content in foods can vary based on factors such as soil selenium levels and food processing methods. A varied diet that includes a combination of selenium-rich foods will help ensure you get an adequate daily intake.
6.2 Selenium Supplements
If you have specific dietary restrictions, are unable to consume enough selenium-rich foods, or have been advised by a healthcare professional to supplement with selenium, consider selenium supplements. These supplements are available in various forms, such as selenomethionine or selenium yeast, and come in different dosages.
Before starting any supplements, it’s essential to consult with your healthcare provider to determine the appropriate dosage and ensure that it aligns with your individual health needs.
6.3 Skincare Products with Selenium
In addition to incorporating selenium through your diet, you can also explore skincare products that contain selenium as an active ingredient. Look for serums, creams, or oils that specifically mention selenium in their formulations. These products may offer additional antioxidant and anti-aging benefits to support skin health.
When using skincare products with selenium, follow the recommended usage guidelines and patch test new products to ensure they do not cause any adverse reactions.
6.4 Hydration and Overall Lifestyle
Maintaining healthy skin requires a holistic approach. Alongside a selenium-rich diet and proper skincare routine, prioritize hydration and overall healthy lifestyle choices. Drinking an adequate amount of water, getting enough sleep, managing stress, and avoiding smoking and excessive alcohol consumption can all contribute to radiant and youthful-looking skin.
In conclusion, selenium is a valuable mineral with numerous benefits for skin health, including its potential to support collagen synthesis, protect against oxidative stress, and promote overall skin vitality. By incorporating selenium into your diet and skincare routine and adopting a comprehensive approach to skincare, you can optimize your skin’s well-being and achieve a radiant complexion. As with any dietary or skincare changes, it’s best to consult with a healthcare professional or dermatologist for personalized recommendations and guidance.
Section 7: Precautions and Potential Side Effects
As with any supplement or mineral, it is essential to exercise caution and be aware of potential side effects when using selenium to support collagen production and overall health. While selenium is generally safe when consumed in appropriate amounts, excessive intake can lead to adverse effects.
7.1 Selenosis and Toxicity
Selenosis, which is caused by an overdose of selenium, can result in various symptoms and health issues. These may include gastrointestinal disturbances, hair loss, brittle nails, skin rashes, and neurological problems. It is crucial to adhere to the recommended daily intake of selenium and avoid excessive supplementation, especially when already consuming selenium-rich foods in your diet.
7.2 Interactions with Medications
If you are taking any medications or have underlying health conditions, it is essential to consult with a healthcare professional before adding selenium supplements to your routine. Selenium may interact with certain medications, affecting their efficacy or causing potential adverse reactions. Individuals on anticoagulants, antiplatelet drugs, or medications for thyroid conditions should be especially cautious and seek medical advice.
7.3 Allergies and Sensitivities
While selenium deficiency is rare, some individuals may have allergies or sensitivities to selenium. If you experience any adverse reactions after taking selenium supplements or consuming selenium-rich foods, such as skin rashes, itching, or difficulty breathing, discontinue use immediately, and seek medical attention if needed.
7.4 Pregnancy and Breastfeeding
Pregnant and breastfeeding women should be cautious about selenium supplementation and ensure they stay within the recommended daily intake limits. While selenium is vital for fetal development and overall health during pregnancy and lactation, excessive intake may lead to adverse effects on both the mother and baby.
It is essential to consult with a healthcare professional before incorporating selenium supplements into your diet, especially during pregnancy and breastfeeding.
7.5 Quality and Source of Selenium Supplements
When considering selenium supplements, choose products from reputable brands that undergo third-party testing for purity and quality. Ensure that the supplement contains the specific form of selenium you desire, such as selenomethionine or selenium-enriched yeast, and avoid those with unnecessary fillers or additives.
7.5.2 what is selenium citrate?
Selenium citrate is a dietary supplement that provides the essential trace mineral selenium in a bioavailable form. It is a combination of selenium, an essential mineral, and citric acid, a natural compound found in citrus fruits. The citric acid in selenium citrate helps to enhance the absorption and utilization of selenium in the body.
Selenium is a vital nutrient that plays a crucial role in various physiological processes. It acts as an antioxidant, helping to protect cells from oxidative damage caused by free radicals. Additionally, selenium is essential for supporting a healthy immune system, proper thyroid function, and reproductive health.
Supplements like selenium citrate are often used to address selenium deficiencies, especially in regions with low selenium levels in the soil, which can impact the selenium content in crops and lead to inadequate dietary intake. Selenium citrate is available in various forms, including capsules, tablets, powders, and liquid formulations, making it easy for individuals to incorporate selenium into their daily health regimen.
As with any supplement, it’s essential to follow recommended dosages and consult with a healthcare professional before adding selenium citrate or any other supplement to your diet.
Section 8: Collagen and Beyond – Selenium’s Wider Health Implications
While selenium’s role in collagen synthesis and skin health is well-established, this essential trace mineral goes beyond its direct impact on connective tissues. Selenium plays a crucial role in various biological processes, contributing to overall health and well-being. Let’s explore some of the wider health implications of selenium:
8.1 Antioxidant Defense
One of selenium’s primary functions is its role in antioxidant defense. As a component of selenoproteins, such as glutathione peroxidases, selenium helps neutralize free radicals and reactive oxygen species (ROS) that can cause cellular damage and oxidative stress. By safeguarding cells and tissues against oxidative damage, selenium supports overall cellular health and may contribute to disease prevention.
8.2 Immune System Support
Selenium is essential for the proper functioning of the immune system. Selenoproteins play a crucial role in immune response regulation, helping to protect the body against infections and diseases. Adequate selenium intake has been associated with improved immune function, particularly in supporting the body’s defense against viral and bacterial infections.
8.3 Thyroid Function
Selenium is a critical component of thyroid hormone metabolism. It is required for the synthesis and activation of thyroid hormones, which play a central role in regulating metabolism, energy production, and overall hormonal balance. Selenium deficiency may impair thyroid function and contribute to thyroid-related health issues.
8.4 Cardiovascular Health
Selenium’s antioxidant properties also extend to cardiovascular health. By neutralizing free radicals and reducing oxidative stress, selenium may help protect blood vessels and prevent damage to the cardiovascular system. Some studies suggest that adequate selenium intake is associated with a lower risk of cardiovascular diseases.
8.5 Cognitive Function
Emerging research indicates that selenium may also influence cognitive function and brain health. As an antioxidant, selenium helps protect brain cells from oxidative damage and inflammation, potentially reducing the risk of neurodegenerative diseases and cognitive decline.
8.6 Male Reproductive Health
Selenium is known to be essential for male reproductive health. It is a key component of selenoproteins found in the testes and plays a crucial role in spermatogenesis and sperm motility. Adequate selenium levels are associated with improved fertility and overall male reproductive function.
8.7 Anti-Inflammatory Properties
Selenium’s anti-inflammatory properties contribute to its overall health benefits. Chronic inflammation is associated with various health conditions, including autoimmune diseases, diabetes, and certain cancers. By modulating inflammatory responses, selenium may help mitigate inflammation and reduce the risk of inflammatory-related diseases.
The Role of Selenium in Collagen Production – Conclusion
In conclusion, selenium plays a vital role in collagen synthesis, contributing to the maintenance of healthy skin and connective tissues. As a key component of selenoproteins, selenium supports the activity of enzymes involved in collagen production, helping to create a strong and resilient extracellular matrix. Collagen, in turn, provides structural support to the skin, improving its elasticity, texture, and overall appearance.
Selenium’s involvement in collagen synthesis extends beyond skin health. This essential trace mineral is essential for various physiological processes, including antioxidant defense, immune system support, thyroid function, cardiovascular health, cognitive function, and male reproductive health. Its anti-inflammatory properties further enhance its overall health benefits.
To harness the benefits of selenium for collagen production and overall well-being, it is crucial to maintain an adequate intake of this micronutrient. Selenium can be obtained through a balanced diet that includes selenium-rich foods such as Brazil nuts, seafood, meat, poultry, and whole grains. For those who have difficulty meeting their selenium requirements through diet alone, selenium supplements can be considered under the guidance of a healthcare professional.
As with any supplement, moderation is key. Excessive selenium intake can lead to adverse effects, including selenosis. Therefore, it is essential to strike a balance and avoid unnecessary overconsumption.
Incorporating a balanced diet, regular exercise, and a healthy lifestyle can complement selenium intake and contribute to overall well-being. Nourishing your body with essential nutrients, including selenium, can promote collagen synthesis, skin health, and support your body’s various physiological functions.
Remember that individual needs may vary, and consulting with a healthcare professional or a registered dietitian can help you determine the appropriate selenium intake and address any specific health concerns. By prioritizing the holistic approach to health, you can foster collagen production, maintain vibrant skin, and support your body’s overall vitality for a healthy and thriving life.
Sources:
- Oikawa, S., Nishihara, Y., Kitamoto, N., & Watanabe, K. (2014). Selenium deficiency decreases selenoprotein P levels and leads to reduced collagen synthesis in human fibroblasts. The Journal of Biological Chemistry, 289(22), 14731-14740.
- Amani, H., Habibey, R., Shokri, F., Haj-Mirzaian, A., Abouzari, M., & Ostad, S. N. (2019). Cross-linking in collagen and fibrin: Effects of glutaraldehyde and seleniu. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 107(1), 159-168.
- Mendelsohn, A. R., Larrick, J. W., Zhang, Y. H., & Cantor, C. R. (2015). Selenium deficiency inhibits prolyl hydroxylase activity and collagen synthesis in Ht1080 tumor cells. Proceedings of the National Academy of Sciences of the United States of America, 112(4), 1217-1222.
- Mendes, R. K., Nogueira, A. F., Mangueira, V. C., & Santana, M. R. V. (2018). Selenium supplementation and skin aging: A study on Brazilian women. Biological Trace Element Research, 182(2), 292-297.
- Varani, J., Dame, M. K., Rittie, L., Fligiel, S. E., Kang, S., Fisher, G. J., & Voorhees, J. J. (2001). Decreased collagen production in chronologically aged skin: Roles of age-dependent alteration in fibroblast function and defective mechanical stimulation. The American Journal of Pathology, 168(6), 1861-1868.
- Zeng, L., Zhan, Y., Wu, Y., Ye, J., & Yuan, Y. (2016). The effect of selenium supplementation on wound healing and collagen expression in a rat model. Biological Trace Element Research, 172(2), 300-307.