Quick answer: the La Roche-Posay Retinol B3 Serum comes closest to the La Roche-Posay Mela B3 Dark Spot Serum: it shares Niacinamide, but not Melasyl. On price, both sit in the Premium tier. It also overlaps with 1 other product below.
Products the Retinol B3 Serum matches
La Roche-Posay
2 of 3
hero actives matched
Same price tierNiacinamideGlycerin
Why it holds up: Shares Niacinamide, but not the original's Melasyl.
Full ingredient analysis →See them side by side →The Ordinary
1 of 2
hero actives matched
Cheaper originalGlycerin
Why it holds up: Shares Glycerin, but not Pycnogenol.
Full ingredient analysis →See them side by side →Common questions
Is the La Roche-Posay Retinol B3 Serum a real dupe?
It shares hero actives with 2 same-category products in our catalogue, most closely the La Roche-Posay Mela B3 Dark Spot Serum (matching 2 of 3 of its hero actives). "Dupe" here means shared key ingredients, not an identical formula.
Does matching more hero actives make it better?
No. The match count only shows how many hero actives are shared. The base, supporting ingredients, texture and price still differ, so use the side-by-side comparison for the full picture.
Educational information only — not medical advice. Overlap reflects shared hero actives, not clinical equivalence.