L-Arginine
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L-arginine is an amino acid, one of the building blocks for proteins in your body. It may help to prioritize muscle-building over fat deposits and limit weight and fat gains due to a high-fat diet, according to an animal study published in the Journal of Nutrition in 2009. A review article published in Amino Acids in 2010 came to a similar conclusion, noting that L-arginine may help make the body more likely to burn fat and minimize the addition of new body fat in both people and animals, helping to promote weight loss, although the mechanisms still aren't totally clear. Further research is necessary to verify these results and determine the best dosage for those looking to improve their weight-loss results. Check with your doctor to determine which dosage you should try.
L-arginine supplements can cause side effects, including diarrhea, bloating, low blood pressure, a worsening of asthma symptoms and pain in the abdomen. They may also interact with medications used for high cholesterol and high blood pressure as well as blood clotting medications, nitrates, Viagra, diuretics and others. People with kidney disease, asthma or herpes or those who have recently had a heart attack shouldn't take L-arginine. It may increase the risk for high potassium levels in people with kidney or liver problems. Always check with your doctor to see if supplements -- including L-arginine -- are safe for you.