If we say we have an allergy or reaction to a specific ingredients (my skin can become extremely itchy or sensitive with nicotinamide). DO NOT have products with this ingredient for our routine or ask if how many products in the routine that could be tolerated with this ingredient!!! Also ask to specify what type of reaction occurs with use on this ingredient: e.g. rash, redness, itching, dry flaking skin, blisters or anaphylaxis