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Field Notes

Four clear water droplets beaded on a thin oil film across a matte limestone surface, with the film's edge visible as a thin line.

What is an anhydrous serum, and when does it beat a water-based one?

Four clear water droplets beaded on a thin oil film across a matte limestone surface, with the film's edge visible as a thin line.
anhydrous

What is an anhydrous serum, and when does it beat a water-based one?

Water is where microbes grow, where L-ascorbic acid breaks down, and what emulsifiers exist to manage. Take it out and a serum can be built from the same lipids the barrier is made of, at full conc...

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