Every product page on the website has a label info tab. On that tab is all of the label information about the formula and how it should be used. This includes a label text file - a word document that can be downloaded.
Any common allergens are declared in the ingredients / allergens section. If none are declared then there are no common allergens present in the formula.
In the example below there are no allergens in the formula:
This is how the same section might look if there were allergens: