angel dusting angel dusting angel dusting is the misleading marketing practice of including a minuscule amount of an active ingredient in a cosmetic, cosmeceutical, dietary supplement, food product, or nutraceutical, insufficient to give any measurable benefit. the advertising materials may claim that the ingredient is helpful and that the ingredient is contained in the product, both of which are true. however, no claim is made that the product contains enough of the active ingredient to have an effect – this is just assumed by the purchaser. for the dissociative drug known as "angel dust", see phencyclidine. for other uses, see angel dust (disambiguation).