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Polysorbate 20 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.
Polysorbate 20 is considered safe at cosmetic use concentrations. Like other PEG-based ingredients, trace amounts of 1,4-dioxane and ethylene oxide may be present from manufacturing, but these are regulated by FDA and EU to acceptable levels. There is no meaningful evidence of carcinogenicity or endocrine disruption at typical cosmetic use concentrations. The CIR has reviewed polysorbates as a group and concluded they are safe for cosmetic use.
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