Approximately five hundred amino acids occur in nature. Twenty of these are amino acids that serve as building blocks for proteins in the human body, these are referred to as 'fundamental amino acids'. These fundamental amino acids can be further subdivided into the categories 'essential', 'semi-essential' and 'non-essential'. L-lysine belongs to the so-called essential amino acids, which means that the body cannot produce it itself from other amino acids, and that one is completely dependent on food to meet one's daily needs. For vegetarians and vegans, the intake of lysine may be insufficient, since animal proteins in particular are rich in lysine.

L-lysine is the precursor of the amino acid carnitine. This product uses the natural L-form of lysine, not the synthetic D-form. Only the L-form is physiologically active. Lysine for use in food supplements is produced by fermentation by micro-organisms. Plants and micro-organisms can produce lysine themselves from the amino acid aspartic acid.

Permitted health claims:
No.

L-lysine HCl, hydroxypropyl methylcellulose (vegetable capsule), anti-caking agent (rice fibre).