What is kojic acid?

Immediate Answer: Kojic acid is a naturally derived compound that inhibits tyrosinase—the enzyme that converts tyrosine into melanin. It's been used in dermatology for decades and is one of the most proven anti-pigmentation ingredients.

The Science: Kojic acid works by binding to copper in the tyrosinase enzyme, essentially disabling it. Without functional tyrosinase, your body can't convert tyrosine (an amino acid) into melanin. It's particularly effective because it stops melanin production at the source—you're helping prevent melanin creation as opposed to trying to fade melanin that's already formed.

How Nordic Formula Uses Kojic Acid: Dark Spot Treatment patches contain kojic acid at therapeutic concentrations (not trace amounts). It's one of nine active ingredients, but it's a key one—the tyrosinase inhibition pathway is fundamental to preventing new pigmentation while other ingredients fade existing spots.

Pro Tip: Kojic acid works best at pH 4-6 (slightly acidic). Nordic Formula formulates products within this range to optimise kojic acid efficacy. Neutral or alkaline pH may reduce kojic acid effectiveness significantly—formulation matters as much as ingredient selection.