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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.
Vitamin supplement: These are used for if you are not getting enough vitamins in your diet, and sometimes includes mineral supplements
Herbal supplements: This can be basically anyone of these, and are in theory derived from some plant.
So-calledSuperfoods: Basically, a plant with almost magical abilities
Pre-Work Out/Post-Work Out: These are chemicals used by people who work out. A Pre-Work Out supplement is meant to increase energy and muscle endurance, and they're usually just caffeine pills. A Post-Work Out is used to increase muscle recovery.
Protein Shake: Different kinds of shakes have different values, but they're used because muscle builds best if you consume an easily absorbed protein within 5 minutes of working out. However, in a test conducted by Consumer Reports, 3 out of 15 tested shakes were found to contain amounts of heavy metals such aslead, cadmium, and arsenic that were slightly above the allowed limit.