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Skin & Hair

Vitamin C Serum: Three Forms of Vitamin C, Plus Fragrance — and How to Tell If It Has Gone Off

At $20 it is the cheapest serum we sell. It contains L-ascorbic acid, which is effective and unstable — here is how to store it and when to throw it out.

Which EvenWell Serum, and In What Order? A Plain Layering Guide

We sell several serums and they are not all meant to go on at once. Here is which does what, which ones conflict, and a morning and evening routine that will not wreck your skin.

EvenWell Retinol + Peptide Serum: Do Not Use This If You Are Pregnant

Retinol is a retinoid, and retinoids and pregnancy do not mix. Plus: why you need sunscreen the next morning, and how to start without wrecking your skin barrier.

GlowWell Essentials: What 5,000 mcg of Biotin Means, and Three Things on the Label You Should Read First

GlowWell contains 16,667% of the Daily Value for biotin, 14.5 mg of iron, and soy. All three of those facts matter before you buy. Here is the whole panel, explained.