L-arginine helps in production of nitric oxide. L-arginine-nitric oxide biosynthetic pathway in pregnancy helps with placental vascular development, fetal growth and improving birth outcomes.

Four other AAs, including arginine and cysteine, are ‘semi-essential’, meaning there are biosynthetic pathways to produce them in humans, but a dietary source is required in some circumstances.

The addition of L-arginine was shown to increase PQ production ... This enhancement is linked to the activation of specific biosynthetic pathways and the upregulation of genes involved in the ...