I‘m standing in my bathroom, looking at two identical bottles of La Roche-Posay sunscreen. Well, almost identical: one is the La Roche-Posay Anthelios UVMUNE 400 Ultra-Light Invisible Fluid SPF50+ that I bought for $25 in a local pharmacy. The other is from eBay, where I spotted two bottles for $17. Bargain!

Except now, I’m not so sure. My beloved pharmacy-bought sunscreen is creamy in color, with no fragrance and a distinctly runny texture. The version that’s just landed on my doormat is bright white, gloopy, and smells suspiciously like basic sunscreen. The packaging may be convincing, but what’s inside—I feel certain—is counterfeit.