Methionine is an amino acid. You need it for protein synthesis and synthesis of other
Please note that this section reports on claims that have not yet been substantiated
Methionine is an antioxidant. It may help protect the body from damage caused by ionizing
radiation and detoxify harmful substances in the body, such as heavy metals. It may
also prevent liver damage in acetaminophen poisoning and inhibit fat deposition in
It may also help ease fatigue and reduce the risk of early balding. It may also be
helpful in osteoporosis.
Amino acids (AAs) are available as individual AAs or in AA combinations. They also
come as part of multi-vitamins, proteins, and food supplements. The forms include
tablets, fluids, and powders.
Note that by eating enough protein in your diet, you get all of the amino acids you
There are no conditions that increase how much methionine you need.
Side effects, toxicity, and interactions
Using a single amino acid supplement may lead to negative nitrogen balance. This can
decrease how efficient your metabolism is. It can also make your kidneys work harder.
In children, taking single amino acid supplements may also cause growth problems.
You should not take high doses of individual amino acids for long periods of time.
Methionine can cause nausea, vomiting, and dizziness. It can also cause drowsiness,
low blood pressure, and irritability. It may also make liver problems worse. Talk
to your healthcare provider before using it if you have severe liver disease.
Women who are pregnant or breastfeeding shouldn’t use methionine supplements.
Toxicity of methionine is rare. It only happens if you take too much of it.
People with homocystinuria type I, an inherited disease, shouldn’t use methionine
If you take methionine supplements without enough folic acid, vitamin B6, and vitamin
B12, it can increase the conversion of methionine to homocysteine. This may increase
your risk for heart disease.