Niacinamide, the unfashionable molecule

Niacinamide is vitamin B3 in amide form, a precursor to NAD, the cofactor that runs cellular repair. On skin it is boring in the best way. Studies at four to five percent show less sebum on oily faces, better barrier lipids, and a quieting of the blotch that men call ‘stress’ and dermatologists call inflammation.

Unlike retinoids, it does not require a six-week apology to the mirror. Unlike acids, it does not thin what a razor already thins. It plays well with ceramides, with zinc, with the rest of a short routine. That is why it sits in the house serum.

Four to five percent is the band where the papers live. More is not a personality.

What it will not do

It will not lift a jaw. It will not replace sleep. At very high percentages some men flush — the same niacin flush that made B3 famous in the 1950s. Formulation matters more than the number on a label.

The interesting fact is NAD itself: levels fall with age, and the skin’s appetite for repair does not. A precursor on the face is not immortality in a bottle. It is a vote for the biochemistry you already have.

Journal notes are for curiosity, not diagnosis. Speak to a clinician before changing medicine, supplements, or training.