A simple rinse-off formula such as a body wash can reach a stable, approved prototype in 8–12 weeks. A complex active-delivery system — a retinol serum with clinical substantiation, for example — can take 12–18 months including accelerated stability testing (typically 12 weeks at 40 °C / 75% RH) and safety assessment. Posting a detailed brief on the AJ Cosmo Labs iOS app helps chemists give you accurate timelines upfront.
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