L-Arginine is an amino acid found in foods such as meat, fish, dairy products, and nuts. It is a so-called semi-essential amino acid, which means your body can usually produce it on its own, but additional intake through food or supplements can be beneficial in certain situations, such as during intense physical activity.

L-Arginine HCl is the hydrochloride form of L-arginine. It is often used in dietary supplements because this form is more soluble in water than pure L-arginine.

The "L" in L-arginine stands for the left-handed form of the amino acid. In nature and in the human body, the L-forms of amino acids are used. The D-form occurs much less frequently and is not used in protein synthesis.

The recommended dosage is one to three capsules per day with water, with a meal of your choice.