L-arginine is classified as a conditionally non-essential amino acid. This means it does not always need to be supplied by the diet, but additional intake may be desirable in certain situations.

Taking it on an empty stomach can promote the absorption of L-arginine, especially for amino acids that may compete for absorption in the gut.

Essential amino acids are supplied by the diet. Non-essential amino acids can also be produced from other nutrients. There are also so-called conditional amino acids, which can be supplemented through diet or supplements in specific situations.

Although natural sources of L-arginine are often animal-based, the form used in supplements is usually produced via fermentation of plant-based sugars. This makes it suitable for vegetarians and vegans.

This supplement contains L-arginine in the form of L-arginine hydrochloride (HCl). This form is widely used in tablets due to its good stability, solubility in liquid, and the ease with which it can be processed into a fixed dosage.