Amino acid
Lysine
Lysine is an essential amino acid the body cannot make. It comes from protein foods such as meat, fish, dairy and legumes.
Also listed as L-Lysine HCl, L-Lysine
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Every rating with its studiesGrouped by health goal, with the publications behind each rating
Why people take it
Essential Health20.5%
Immune Support15.9%
Energy15.4%
Fitness14.9%
Gut Health7%
Bone & Joint4.9%
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Histidine
Glycine
L-Threonine
L-Glutamine
L-Cysteine
Leucine
Isoleucine
L-Methionine