Nutrition Supplements
A nutritional supplement is a marvelous thing. It can be a vitamin, a food, a random plant extract, a chemical that probably won't actually kill you, or even nothing at all. It can be promoted as medicine only not quite and isn't sufficiently regulated that you need to actually prove it's effective for anything at all, as long as you don't make any specific health claims.
A handy way to sell them is as vitamins. The churlish might say you were selling pseudovitamins, but they just want to undermine the health freedom of your potential customers.