Editing Collagen (section)

=== Cosmetics ===
{{more medical citations needed|section|date=March 2023}}
[[Bovine]] collagen is widely used in [[dermal filler]]s for [[Aesthetics|aesthetic]] correction of wrinkles and skin aging.<ref>{{Cite news | vauthors = Wasley A, Mendonça E, Zuker F |date=2023-03-06 |title=Global craze for collagen linked to Brazilian deforestation |language=en-GB |work=The Guardian |url=https://www.theguardian.com/environment/2023/mar/06/collagen-linked-brazilian-deforestation |access-date=2023-03-06 |issn=0261-3077}}</ref> Collagen cremes are also widely sold even though collagen cannot penetrate the skin because its fibers are too large.<ref name="harv">{{Cite web |date=2021-05-26 |title=Collagen |url=https://www.hsph.harvard.edu/nutritionsource/collagen/ |access-date=2023-03-06 |website=Harvard T.H. Chan School of Public Health: The Nutrition Source |language=en-us}}</ref> Collagen is a vital protein in [[skin]], [[hair]], [[Nail (anatomy)|nails]], and other tissues. Its production decreases with age and factors like sun damage and [[smoking]]. Collagen supplements, derived from sources like [[fish]] and [[cattle]], are marketed to improve skin, hair, and nails. Studies show some skin benefits, but these supplements often contain other beneficial ingredients, making it unclear if collagen alone is effective. There's minimal evidence supporting collagen's benefits for hair and nails. Overall, the effectiveness of oral collagen supplements is not well-proven, and focusing on a [[healthy lifestyle]] and proven skincare methods like [[Sunscreen|sun protection]] is recommended.<ref>{{cite web |title=Considering collagen drinks and supplements? |url=https://www.health.harvard.edu/blog/considering-collagen-drinks-and-supplements-202304122911 |website=Harvard Health Blog |publisher=Harvard Health Publishing |date=2023-04-12 |access-date=2024-07-19}}</ref>