Life Extension, D, L-Phenylalanine Capsules, 500 mg, 100 vegetarian capsules Athletic Arginine and ornithine are protein-building

Arginine and ornithine are protein-building amino acids that promote muscle strength and recovery after exercise

including premium B-vitamins to convert food into cellular energy – all in one convenient tablet

Niacinamide - 10 mg

and irritability

Life Extension, D, L-Phenylalanine Capsules, 500 mg, 100 vegetarian capsules Athletic Arginine and ornithine are protein-buildingDescription Phenylalanine supplementation helps in the production of healthy neurotransmitters (dopamine, norepinephrine and epinephrine). Clinical trials suggest it may promote positive moods. Phenylalanine is an essential amino acid, which means your body can't produce sufficient amounts and requires it from an external source. It's converted to L tyrosine in the liver, which is then converted into dopamine, norepinephrine and epinephrine