Reputable cGMP-compliant manufacturers will either perform stability testing in-house or coordinate it with a third-party lab. You should request accelerated stability data (typically 4 weeks at 40°C and 75% humidity) and real-time data before finalizing your formula. Ask specifically whether kojic acid concentration is tested at start, three months, and six months. AJ Cosmo Labs lets you outline these requirements in your brief so only qualified manufacturers respond.
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