L-Arginine is an amino acid that the body can partially produce itself but can also be obtained from food. It naturally occurs in protein-rich foods like meat, fish, dairy, and nuts. In supplement form, it is often used by athletes.

A free amino acid is a single, unbound form of an amino acid. It is often used in supplements without being part of a protein chain.

Protein-rich foods can interfere with the absorption of arginine. This is because other amino acids use the same transport mechanisms in the gut, which can reduce arginine absorption. Taking it on an empty stomach optimizes absorption.

Yes, L-arginine can often be combined with other supplements such as creatine or protein supplements. Consult a doctor for personal advice, especially if you are taking medication.

This means that the body can produce the amino acid under normal circumstances. However, in certain situations such as rapid growth, illness, or stress, the need for the amino acid may exceed what the body can produce.