Dietary supplements are products which are not pharmaceutical drugs, food additives like spices or preservatives, or conventional food, and which also meet any of these criteria:

The product is intended to supplement a person's diet, despite it not being usable as a meal replacement.

The product is or contains a vitamin, dietary element, herb used for herbalism or botanical used as a medicinal plant, amino acid, any substance which contributes to other food eaten, or any concentrate, metabolite, ingredient, extract, or combination of these things.

The product is labeled as a dietary supplement. https://sites.google.com/site/alldietarysupplements