Non-nano zinc oxide uses particles typically larger than 100 nanometers, which remain on the skin surface and are preferred by reef-safe and clean-beauty certifications such as Ecocert and Hawaii Act 104 compliance. Nano zinc oxide produces a sheerer, more cosmetically elegant finish but raises environmental and some regulatory concerns. Ask your manufacturer for the particle size CoA for their zinc oxide dispersion. AJ Cosmo Labs formulators can advise on which grade fits your brand positioning.
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