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Retinaldehyde: does it work, and at what %?
Retinaldehyde 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: Retinaldehyde converts to retinoic acid in one step, giving retinol-like results at lower doses.
How we grade Retinaldehyde
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. Also labeled as Retinal.
10 graded products with an effective dose of Retinaldehyde
69/100 C The Ordinary Retinal 0.2% Emulsion
63/100 C Medik8 Crystal Retinal 6
63/100 C The INKEY List Advanced 0.2% Retinal Serum
63/100 C Geek & Gorgeous A-Game 10 (0.1% Retinal Serum)
63/100 C Geek & Gorgeous A-Game 20 (0.2% Retinal + 1% Ectoin Serum)
63/100 C Naturium Retinaldehyde Cream Serum 0.10%
63/100 C Naturium Retinaldehyde Cream Serum 0.15%
63/100 D Geek & Gorgeous A-Game 5 (0.05% Retinal Serum)
57/100 D Naturium Retinaldehyde Cream Serum 0.05%
57/100
Common questions
What concentration of Retinaldehyde is effective?
On Visage Theory's rubric, Retinaldehyde reaches an effective dose at 0.05% and a strong, research-backed dose at 0.1%. Below that, the labeled benefit is unlikely no matter how good the marketing is.
Is more Retinaldehyde 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 Retinaldehyde?
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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