How to spot fake skincare products? The packaging tells the truth.

A thread on r/30PlusSkinCare with the title 'I am once again asking you to not buy skincare on Amazon' has thousands of upvotes and hundreds of comments from people who received counterfeit products in genuine-looking packaging. The original poster described a La Mer jar from Amazon that had a 'thinner, cheaper-feeling glass' compared to the same product purchased directly from the brand. The counterfeit packaging is the tell — and it reveals exactly what to look for in genuine cosmetic glass.\n\nGenuine cosmetic glass has consistent wall thickness. Hold the bottle up to a light source: a premium glass [dropper bottle](https://www.veslapack.com/serum-bottles) will show uniform light transmission from base to shoulder. Counterfeit or low-quality glass often has uneven thickness — visible as darker bands or ripples when backlit — caused by inconsistent mold temperature during forming. This isn't just an aesthetic issue; uneven wall thickness creates stress points that make the bottle more likely to crack during shipping or when dropped.\n\nThe second tell: decoration quality. Genuine silk-screen printing on glass has crisp edges with no bleeding, and you can feel a slight raised texture when you run your finger over the ink. Counterfeit silk-screen often has fuzzy edges (the screen mesh was stretched or damaged) and the ink scrapes off with a fingernail (they skipped the curing oven to save time). Hot-stamping on genuine packaging leaves a uniform metallic finish; counterfeit hot-stamp is often patchy with visible gaps in the foil.\n\nFor brand owners: these same quality differences distinguish professional manufacturers from low-cost trading companies. When you receive a sample, do the backlight test, the fingernail scrape test, and the drop test (from 1 meter onto a hard floor — a well-made bottle survives; a cheap one doesn't). The supplier who passes all three is the supplier whose bottles won't generate Reddit threads about fake products.