La Roche‑Posay Mela B3 UV Daily Moisturizer SPF 30 is a daily‑use moisturizer + sunscreen designed to protect skin from UV damage and help correct skin discoloration, dark spots, and uneven tone. It combines broad‑spectrum UV filters with brightening and barrier‑supporting actives, so you get hydration, sun protection, and tone‑evening benefits in one.

Key ingredients and their benefits

Melasyl™ — a proprietary multi‑patented ingredient from La Roche‑Posay. It is designed to target persistent dark spots and discoloration. According to the brand, Melasyl helps reduce dark marks while respecting the natural skin tone.
Niacinamide (about 5%) — a form of vitamin B3 with well-known benefits: helps fade dark spots, supports even skin tone, and may improve skin barrier and texture over time.
Sun filters / SPF 30 broad‑spectrum protection — to shield skin from UVA/UVB rays that contribute to new pigmentation, sun damage, and premature aging. Using a moisturizer with SPF helps prevent further dark spot formation while treating existing discoloration.
Hydrating and emollient components (e.g. glycerin, shea butter) — to maintain skin’s moisture, support barrier health, and deliver a comfortable, non‑dry finish even with active ingredients and sunscreen.
Gentle, non‑comedogenic, dermatologically tested formula — according to the brand, the moisturizer is suitable for all skin types, including sensitive skin.

Features & What It Does

Dual function: Combines sun protection (SPF 30) with skin‑tone correction and moisturizing. That means you get both prevention (UV protection) and treatment (brightening/dark‑spot correction).
Corrects discoloration and dark spots: Over time, the combination of Melasyl + niacinamide aims to reduce the appearance of existing dark spots, age spots, sun‑spots, or post‑inflammatory hyperpigmentation. The brand claims visible improvement in uneven tone and skin radiance.
Improves skin texture and tone: Helps smooth rough texture, fine lines, and gives a more even, radiant complexion when used regularly.
Invisible, lightweight finish: The moisturizer is formulated to be light, blend easily, and work under makeup — useful for everyday use without feeling heavy or sticky.
Helps prevent new pigmentation: With consistent SPF protection plus brightening ingredients, it supports both prevention and correction of dark spots.

How to Use

Apply generously to face and neck as the last step of your morning skincare routine (after cleansing and serums).
Do so about 15 minutes before sun exposure to allow the sunscreen to bind to skin properly.
If you’ll be outdoors for extended periods, reapply every 2 hours (or per the general sunscreen reapplication guidance).
Can be used alone or under makeup — its lightweight, non‑sticky finish makes layering easy.