An herbal health product or supplement (also called a botanical product) is a type of dietary supplement that contains one or more herbs. Examples of common herbal health products and supplements include black cohosh, echinacea, garlic, ginkgo, saw palmetto.

Vitamin B12 is a water-soluble vitamin that is involved in the metabolism of every cell of the human body: it is a cofactor in DNA synthesis, and in both fatty acid and amino acid metabolism.