Dark spots & uneven tone
Pigment responds to patient, consistent treatment — and relapses fast without sun protection. Several actives have real trial support here.
What has evidence, ranked
Independent trials and meta-analyses agree on melasma
90 trials/reviews indexed · multiple independent trials or a meta-analysis agree
Fades uneven pigmentation over a few months
12 trials/reviews indexed · one or two solid randomized trials
Proven to fade spots at 4–5% — modest but real
14 trials/reviews indexed · one or two solid randomized trials
Comparable to hydroquinone in melasma trials
10 trials/reviews indexed · one or two solid randomized trials
Reliable gradual brightening through exfoliation
30 trials/reviews indexed · one or two solid randomized trials
Trial-supported brightening, usually as a co-star
4 trials/reviews indexed · one or two solid randomized trials
Popular for brightening; the trial data is surprisingly thin
35 trials/reviews indexed · a small trial, or mostly lab data so far
Popular brightener, thin independent evidence
4 trials/reviews indexed · a small trial, or mostly lab data so far
Brightening is inferred more than demonstrated
Brightening signal in small combination trials
Sample products that cover it
From the demo catalog — ranked by their best evidence for dark spots.
Honest note: no serum outruns the sun
Every fading ingredient works only alongside daily SPF — UV re-triggers pigment faster than actives fade it. And skip DIY lemon juice: it's phototoxic, the opposite of brightening.