According to the EU regulation 1223/2009, perfume allergens must be declared on the label of ingredients, when they are present in concentrations exceeding 0.001% in leave-on products and 0.01% percent in rinse-off products. There are currently 26 allergens that are regulated.
Auto determining Labelling requirements
The software auto determines the allergen labelling requirements from materials directed added to the formula and those indirectly added to the formula via natural complex substances such as Oils, Absolutes, etc.
[The software can also be extended for determining more complex labelling requirements such when sum of two or more ingredients should be below a cut off.]