Beef tallow and snail mucin may have been the wildest, sworn-upon skin care remedies you’ve heard of — until now. Enter salmon sperm. Listed as the main ingredient in a handful of top-selling products on the TikTok shop, salmon sperm, more specifically PDRN, has rapidly become regarded as the ineffable answer to hydrated, “glass skin” online, with just over 80,000 videos related to “salmon sperm facials” and “salmon sperm skin care” on TikTok alone. What’s the catch? Aside from the actual fish, there isn’t one. PDRN (polydeoxyribonucleotide) is a naturally occurring fragment derived from salmon sperm DNA. “Essentially, these are DNA fragments from salmon that are very similar to our own DNA, which means our bodies can recognize and use them to repair skin,” Dr. Diane Alexander, a board-certified plastic surgeon and founder of Artisan Plastic Surgery and Artisan Beauté, told WWD. Dr. Alexander likened PDRN to a “turbo-charge repair kit” — but for skin cells. “When applied (or even injected) into the skin, PDRN has been shown to stimulate the production of new blood vessels and boost collagen and elastin synthesis. This means it encourages better blood flow (angiogenesis) and helps your skin rebuild its support structure,” Dr. Alexander explained. “By jump-starting

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