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Lactic Acid: does it work, and at what %?
Lactic Acid is one of the actives we grade on evidence, not marketing. The benefit is real — but only when the dose clears the threshold the research supports. Here's the number, and the products that actually hit it.
The verdict: Lactic acid exfoliates while being more hydrating and gentle than glycolic acid.
How we grade Lactic Acid
We check the disclosed concentration against the effective threshold from peer-reviewed dermatology literature and regulatory monographs, then weigh the formulation and any product-specific study. The grade is computed from the open rubric — re-run it on any ingredient list and you get the same letter.
2 graded products with an effective dose of Lactic Acid
Common questions
What concentration of Lactic Acid is effective?
On Visage Theory's rubric, Lactic Acid reaches an effective dose at 5% and a strong, research-backed dose at 10%. Below that, the labeled benefit is unlikely no matter how good the marketing is.
Is more Lactic Acid always better?
Not necessarily — past the effective range you mostly add irritation risk, not benefit. What matters is clearing the threshold in a stable formula, which is exactly what our grade checks.
How do I know a product actually contains an effective dose of Lactic Acid?
Most brands list the active but hide the concentration. When the dose isn't disclosed we can't confirm efficacy, so we withhold a grade rather than guess. Products that disclose an effective dose are graded and listed below.
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