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Field Notes

Pale golden oil fading to clear on a warm white surface, representing oil-soluble vitamin C.

Oil-soluble vitamin C vs L-ascorbic acid: stability, delivery, and evidence

Pale golden oil fading to clear on a warm white surface, representing oil-soluble vitamin C.
antioxidants

Oil-soluble vitamin C vs L-ascorbic acid: stability, delivery, and evidence

Skin uses L-ascorbic acid. THD ascorbate carries that vitamin in a modified, oil-soluble form that skin enzymes convert. Its value lies in how the molecule, lipid base, and supporting antioxidants ...

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A thin clear oil spreading across a matte cement surface and filling a fine network of hairline cracks, with the cracks ahead of it still dry.
barrier repair

Occlusives, emollients, and humectants: which does a compromised barrier need?

A damaged barrier is short on its own lipids, and water loss is the signal that tells it to make more. Seal the skin completely and repair slows. Add a humectant alone and water loss rises. The mat...

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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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