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Updated: 7 May 2026
Pigmentation spots are one of the most common skincare issues and can occur after sun damage, acne or hormonal changes. They are often stubborn because they form deep within the skin's pigmentation process and not just on the surface. Treating hyperpigmentation therefore requires patience, consistency and a combination of the right ingredients and strict sun protection.
La Roche-Posay Mela B3 Serum is a product in the brand's pigmentation care range. It refines previous niacinamide-based formulations by combining 10% niacinamide with the new ingredient Melasyl, developed to counter pigmentation and uneven skin tone.
Mela B3 is a pigment‑evening serum from La Roche-Posay and can be seen as an evolution of the brand's earlier niacinamide-based serums. The formula change is the addition of Melasyl, an ingredient the manufacturer says took a long time to develop.
Melasyl interacts with the skin's melanin. Most traditional ingredients against pigmentation, such as kojic acid, work by inhibiting the enzyme tyrosinase (which in turn slows melanin production). Melasyl instead works by binding melanin precursors. The idea is to "capture" the pigment before it has time to appear as dark spots on the skin surface.
The serum has a light gel texture that absorbs quickly. Because pigment spots are triggered and worsened by UV radiation, it is important to use sun protection (at least SPF 30) every day. Without sun protection the active ingredients in the serum will be working against the elements, since sunlight stimulates precisely the process Melasyl aims to slow.
Compared with products that use stronger acids, this is a milder option. That means it often works for people with sensitive skin, but it also means results are gradual. One should not expect a noticeable difference before at least 8–12 weeks of consistent use.