Standard testing includes accelerated stability (40°C, 75% humidity for 12 weeks), preservative efficacy (challenge testing per USP/Ph.Eur), microbial limits, and pH stability over time. Irritation and efficacy claims may require in-vitro or in-vivo studies. Costs range $2,000-$8,000+ depending on scope. Partner with a certified lab or cosmetic chemist to design a realistic testing protocol for your target market.
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