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Verkhratsky, A., Zorec, R

The bottom line: Don't take a supplement you don't need

Peptides are short chains of amino acids the same building blocks that make up proteins but typically consist of 2 to 50 amino acids

Vitamin B12 Deficiency People most at risk for vitamin B12 deficiency include those over the age of 65, vegans and vegetarians (who often dont eat enough animal products), people who have gastrointestinal diseases like Crohns disease or celiac disease, and anyone who has had part of their gastrointestinal tract removed through gastric bypass or another type of surgery, Wright says

J Inherit Metab Dis 13:755756 Polson J, Wians FH Jr, Orsulak P, Fuller D, Murray NG, Koff JM, Khan AI, Balko JA, Hynan LS, Lee WM (2008) False positive acetaminophen concentrations in patients with liver injury

Their wide range of efficacy and stability make them popular options and they are often used in combination due to synergistic effects