L-citrulline is a non-essential (conditionally essential) amino acid micronutrient that the body cannot produce in sufficient quantities, especially during greater stress, which is why supplementation may be necessary. Citrulline is found in large quantities in fruits, for example watermelon. The synergistic combination of the amino acid L-citrulline with malic acid produces L-citrulline malate. Malic acid (malate) is an organic acid that occurs naturally (for example in apples). The amino acid L-citrulline is the basis for the production of the amino acids L-arginine and L-ornithine. Are you looking for a meaningful article description? Under current EU law and the Health Claims Regulation, a detailed and comprehensive presentation of dietary foods is no longer possible. The Health Claims.