INGREDIENT GLOSSARY

It does not come from animal sources and is not strictly collagen: how it is obtained, what it really contains, and what effects it may have when applied to the skin.

Not all active ingredients work the same way. The main categories of functional ingredients, how they affect the barrier, and how to choose the right ones.

Alpha hydroxy acids are not all the same: molecular weight determines penetration and tolerability. Glycolic, lactic, and mandelic acids compared, including the forms they come in and which one to choose.

Zincidone combines zinc and L-PCA and works at the source by regulating sebum production, rather than merely absorbing it. How it works, what the manufacturer’s tests show, and which skin types it is suitable for.

L-arginine is an amino acid found in the skin’s Natural Moisturizing Factor. What role does it play in hydration and elasticity, and why does it work well together with vitamin C and ferulic acid?

Water-soluble azelaic acid derivative combined with glycine: effective at low concentrations and much better tolerated. How it works on sebum and dark spots.

Thermal water soothes for three reasons: its thermal effect, dissolved minerals, and the absence of irritants. What it is, what it contains, and the mistake that cancels out its hydrating effect.