Allergen. This ingredient has some wonderful properties, but it is on the published lists of most common allergens. Still, that doesn’t mean you’re allergic to it. To be sure, ask

Allergen Nickel Not just an allergen or a top allergen, nickel is frequently the number one common allergen on published allergen lists, and was the 2008 Allergen of the Year of the American

 Allergen. Rubber is one of the top allergens and can also cause problems in rubberized plastics. Rubber can cause rashes, peeling, itching but also hyper- and hypopigmentations. If you think

 Allergen. They are common allergens themselves and, like limonene and linalool, a source of allergens (both limonene and linalool can be extracted from citruses). If you’ve patch tested positive to

 Not An Allergen. Excellent sunscreens, neither zinc oxide nor titanium dioxide are on published allergen lists. Also called “mineral,” “physical” or “inorganic” sunscreen actives, both are also frequently recommended as safer

 Allergen.  Eucalyptus is an allergen, even when completely natural, fresh and organic. If you’re not allergic, it’s wonderful. To be sure, and if you think you might have contact dermatitis, ask

 Not An Allergen. Glass is inert, very chemically stable, and does not react with other substances or absorb them…making glass a great option as a packaging material for formulations with active ingredients (the

 Not An Allergen.  Baking soda is another classic favorite of many dermatologists for its versatility and non-allergenicity. It’s a great option, for example, for household cleaning products (alone or with