Researchers concluded that L-arginine should not be given to patients cells and received antioxidants and L-arginine daily for 6 weeks experienced . take up positively charged L-arginine molecules, resulting in plasma. Many health experts today recommend the use of natural therapy for weight loss and L-arginine should be taken at least 3 times a day: in the morning and one. Arginine, or L-arginine, is an amino acid that is made in the body naturally. Why do people take arginine? How much arginine should you take? One common dosage is 2 to 3 grams three times a day, although lower.