Avoid tea tree oil above 1% concentration, parabens in sensitive-skin lines, artificial dyes linked to irritation, and any essential oil on the ASPCA toxic list — including eucalyptus, pennyroyal, and clove. Cats are especially sensitive to phenols and certain terpenes. A qualified pet care formulator on AJ Cosmo Labs will review your ingredient deck against current safety standards before finalizing your formula.
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