Dietary supplements are any vitamin, mineral, herbal product, or other ingestible preparation that is added to the diet to benefit health.examples:

Branched Chain Amino Acids

Citrulline Malate

Creatine

Curcumin

Fish Oil

Testosterone Boosters

Vitamin C

Vitamin D

Zinc

Green tea

Echinacea

Glucosamine 

Saw Palmetto

Ginkgo

Garlic