Beauty Science
Deep Dive
Testing Protocols
Stability testing subjects products to accelerated conditions — elevated temperatures (40°C/75% RH), freeze-thaw cycles, light exposure, and centrifugation — to predict long-term behavior. Real-time testing at ambient conditions runs concurrently over 6-36 months. Parameters monitored include pH, viscosity, color, odor, microbial count, and active ingredient concentration.
Regulatory Requirements
Most regulatory frameworks require stability data to support product shelf life claims and PAO (period after opening) designations. The EU Cosmetics Regulation mandates stability data in the Product Information File, while GMP standards require ongoing stability monitoring of manufactured products.
Formulation Implications
Stability testing often drives formulation decisions. An elegant formula that separates after three months is commercially unviable regardless of its efficacy. Antioxidants, chelating agents, and appropriate packaging (airless pumps, opaque containers) help maintain product stability.
OSF Perspective
OSF values stability testing as the quality assurance backbone of beauty — it ensures that the product a consumer opens six months after purchase delivers the same experience and benefits as the day it was made.
Related Terms
Formulation | Preservative System | Regulatory Compliance (Cosmetics) | Contract Manufacturing
Notable Brands
Nelson Labs, Intertek, SGS, Eurofins, AMA Laboratories