The Fragrance Allergen Checker

Field notes

The checker takes supplier-certificate percentages and a fragrance dose, then performs the dilution into the finished cosmetic. It supports multiple fragrance or essential-oil inputs so shared allergens can be added together, and distinguishes leave-on from rinse-off thresholds of 10 ppm and 100 ppm. The page also flags a separate declaration issue for botanicals: the oil itself may need to be listed alongside its constituent allergens. It explicitly limits its scope to this allergen-label calculation rather than full formula compliance.