Mica (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.
Cosmetic-grade mica is considered safe. The primary safety concern is not toxicity but rather the ethical issue of child labor in mica mining, particularly in India. From a toxicological standpoint, cosmetic mica is inert and non-toxic at topical use levels. Inhalation of mica dust in occupational (mining) settings is associated with respiratory disease, but this is not relevant to consumer cosmetic use. Synthetic mica (synthetic fluorophlogopite) addresses both the child labor and purity concerns.
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