Amino acids work together to form protein, although these nutrients each play a specific role in your body. Some amino acids may help you lose weight, while others show little effect in the area of obesity and body fat. Talk to your doctor before taking amino acid supplements to gain or lose weight, especially if you are pregnant or take medication.
Tryptophan
The FDA banned the sale of tryptophan supplements in 1989, although 5-HTP is available as a supplement. Your body naturally makes 5-HTP from tryptophan you consume in your diet. This substance may help in the treatment of depression, migraines, insomnia, fibromyalgia and obesity, although more studies are necessary to confirm potential benefits and risks. Preliminary evidence indicates that 5-HTP may help reduce appetite and weight, according to National Institutes of Health online medical encyclopedia Medline Plus.
L-carnitine
Your body uses L-carnitine to help convert fat into energy. Healthy individuals usually produce adequate amounts of this substance, although red meat, fish, poultry, peanut butter and wheat also supply this nutrient. L-carnitine is a common ingredient in weight-loss supplements. L-carnitine may help reduce fat mass and increase muscle mass, according to the University of Maryland Medical Center. Scientific research does not show that this substance promotes weight loss, however.
L-lysine
L-lysine is an amino acid that your body can't manufacture on its own. Natural sources of this essential amino acid include cheese, sardines, eggs, tofu, red meat, poultry and pork. L-lysine plays an important role in helping convert fatty acids into energy. It also helps lower your cholesterol and may improve calcium absorption. There is no evidence that taking supplements of this amino acid can help promote weight loss. Symptoms of lysine deficiency include slow growth, anemia, dizziness, loss of appetite, fatigue and nausea.
Precautions
Even though some weight-loss products contain certain amino acids, these substances are not scientifically proven appetite suppressants or customary weight-loss aids. Amino acid supplements may interact with medications and can cause side effects, especially in high doses. Too much L-carnitine may cause diarrhea, while excessive amounts of L-lysine might increase your risk of gallstones. Taking 5-HTP may be unsafe, according to Medline Plus. It can cause a serious muscle condition and blood abnormalities. It can also cause nausea, flatulence and heartburn.
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