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Potassium Sorbate (Cosmetic) is permitted by the US FDA. Several countries restrict, warning-label, or have reviewed it for safety concerns. The US has more lenient additive rules than the EU, UK, Canada, and Japan, which is why this ingredient remains widely used here.
Potassium sorbate is one of the least allergenic preservatives used in cosmetics. The CIR and EU SCCS have confirmed its safety at permitted concentrations (≤0.6% in EU cosmetics, as sorbic acid equivalent). It is non-mutagenic, non-carcinogenic, and not an endocrine disruptor. Mild skin sensitization is possible but uncommon. It is widely accepted in natural and organic cosmetics certifications.
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See the full Potassium Sorbate (Cosmetic) deep-dive page for regulatory citations, products that contain it, and verified clean swaps.