NAD+, peptides and collagen extract, explained plainly

Three ingredient names carry most of the marketing in firming skincare. Here is what each one is doing in a bottle, without the lab-coat theatre.

NAD+

A cofactor involved in cellular energy. In a topical formula it is the anchor ingredient of the complex, and it is why the serum is positioned around firmness rather than brightening.

Peptides

Short chains of amino acids that support the look of a smoother, firmer surface. They are gentle, which is why they suit daily use on all skin types.

Collagen extract

It does not replace your own collagen — no topical product does. What it does well is hold water at the surface, which reads as density and elasticity.

Glycerin and arginine

The quiet workhorses. They carry the hydration that makes everything above feel comfortable instead of tight.

What to expect honestly

Cosmetic products work on the appearance of the skin. Expect smoother texture within days, a firmer-looking surface over weeks — and no substitute for sun protection or a clinical procedure.