Formulation · 7 min read
Understanding pH in AHA Formulations
Why pH controls everything — efficacy, tolerance, and regulatory compliance in Australia.
Updated 11 June 2026 · Reviewed by GlycolicAcid.com.au editorial
The TGA limits leave-on AHAs to ≤10% at pH ≥3.5 in cosmetics. Lower pH increases free acid and efficacy, but also irritation.
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