Insulin is a FDA approved substance with therapeutic properties. How you label it is irrelevant. You can't sell heroin with a "nutritional supplement"label eit

Insulin is a FDA approved substance with therapeutic properties. How you label it is irrelevant. You can't sell heroin with a "nutritional supplement"label either. If a substance has no classification(neither controlled nor therapeutic) however, like water for example; you're free to sell it, to treat dehydration, or put a homeopathy label on it and sell it to cure cancer if you prefer.