When it comes to weird beauty ingredients, I’ve seen my fair share ( snail mucin , you were hard to beat). But the latest trend stopped me in my tracks: salmon sperm. It also goes by PDRN (that’s polydeoxyribonucleotide to you). While long popular in Korea, it’s taken time for this rather novel ingredient to make inroads here. That changed when Kim Kardashian, on the heels of Jennifer Aniston , revealed that she had tried a salmon sperm facial last summer. Since then, the ingredient’s popularity has skyrocketed, seeing over 1,000 percent year-over-year growth and search interest on Google explode 162 percent, per trend forecasting firm Spate .

Predictably, the procedure comes at a cost, with the Los Angeles Times reporting that one Beverly Hills-based med spa offers the fac

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