L-arginine is the active ingredient in ProArgi-9+, states Synergy Worldwide, the product's manufacturer, on its website. Some side effects of L-arginine include nausea, cramps, diarrhea, allergic reactions and asthma symptoms, reports WebMD.
ProArgi-9+ may also lower blood pressure and trigger changes to glucose levels and blood chemistry. Some medical researchers debate whether the proportion of lysine to arginine, in either an individual's food or supplement intake, may cause dormant herpes simplex virus symptoms to appear. Individuals with a history of cancer, asthma, allergies, or liver or kidney issues should consult a doctor before taking ProArgi-9+ or anything containing L-arginine. Those with low blood pressure, sickle cell anemia or another blood ailment should also speak with their medical professionals before beginning an L-arginine regimen, urges WebMD. L-arginine potentially interacts with certain medications, such as birth control pills, hormone replacement therapies and blood thinners. It also potentially interacts with erectile dysfunction, heartburn, high blood pressure and diabetes medications, as well as with vitamin and mineral supplements such as gingko biloba, garlic and potassium.
L-arginine is an amino acid that helps the human body build proteins, explains WebMD. Individuals can acquire it through diet, as it is present in red meat, poultry, fish and dairy products. L-arginine can also be synthesized in a laboratory and formulated as a dietary supplement or an ingredient in medicines.