Amino acid
Proline
Proline is an amino acid the body can make itself. It is one of the main building blocks of collagen.
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
Fitness19.7%
Essential Health19.3%
Bone & Joint12.7%
Gut Health10.7%
Hair & Skin9.7%
Weight Management8.7%
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Collagen