According to WebMD, a recommended dosage for Arginine, known also as L-arginine has not been set. L-arginine has been safely used in trials with minimal side effects, such as bloating and abdominal pain. Medical advice should be sought when using this amino acid while taking certain medications.
Doses of L-arginine have been tested in amounts up to 30 grams, or 3,000 milligrams, according to Drugs.com. The L-arginine Plus website sells a supplement containing 5,000 milligrams of L-arginine and claims that research studies have been done finding that 4,000-6,000 milligrams are needed for the dosage to be effective in treating high blood pressure and promoting cardiovascular health. This website also shows a testimonial from a physician saying the product works.