L-citrulline

L-citrulline is a non-proteinogenic amino acid and is structurally derived from L-arginine. It got its name from the watermelon Citrullus Lanatus, in whose flesh it was first detected. Industrially, L-citrulline is obtained by fermentation or from arginine and is available as a stable powder. Due to its clearly defined chemical structure, it is one of the characteristic amino acid derivatives in effective dietary supplements