Proline is a non-essential amino acid with a distinctive chemical structure that sets it apart from most other amino acids and gives the protein it is built into a special fold. Proline is best known for its role in collagen, the most important structural protein of connective tissue, skin and cartilage.
The body can make proline itself from other amino acids, so an intake from food is not strictly necessary. Proline is nevertheless present in relevant amounts in protein-rich foods such as meat, dairy products and gelatine.
Relevance for nutrition and sport
Because of its close link to collagen, proline is often mentioned in connection with the health of tendons, ligaments and connective tissue, for example after intense physical exertion. Collagen supplements contain a notable share of proline alongside glycine, which is why the two amino acids are often considered together.
A separate supplement of pure proline is not necessary for most people, as the body can make it itself and a balanced diet supplies sufficient amounts. The collagen guide explains more about the possible role of collagen for connective tissue and joints. An isolated benefit of proline alone can hardly be derived from the research so far.
