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Tretinoin (prescription retinoid): 4 of 10 (40%)
Peptides in skincare have the ability to penetrate the upper layer of the skin and signal specific functions such as collagen, elastin and hyaluronic acid support so skin can be firmer, thicker, smoother and more elastic
[DOI] [PubMed] [Google Scholar] 100.Keremi B., Lohinai Z., Komora P., Duhaj S., Borsi K., Jobbagy-Ovari G., Kallo K., Szekely A.D., Fazekas A., Dobo-Nagy C., et al
The exception is other copper-containing peptides, where cumulative copper exposure becomes a consideration
Mens Health 37 , 138147 (2019)
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