The results of skin allergy test that lasted 2 years in North America were published in Dermatitis Jan-Feb, 2015. 70 potential allergens were evaluated among 4238 individuals (over 2700 individuals have at least one allergic reaction to one of the allergens evaluated).
Here are a few ingredients that have shown to lead to skin allergy or allergic contact dermatitis:
This interesting study has shown the beginning of epidemic of sensitivity to methylisothiazolinones in North America. Methylisothiazolinones are commonly used preservatives in skin care and beauty products including facial creams, lotions, sunscreens, shampoos, conditioners, body washes. They are widely used in many baby skincare products as well. However Methylisothiazolinones are skin sensitizers that make your skin more sensitive and more prone to allergic reactions over time. Such findings have been well documented in Europe.