L-methionine is an essential sulfur-containing amino acid that your body cannot make on its own, meaning you must get it from food or supplements.
- Builds proteins: Acts as a building block for proteins and tissues.
- Creates SAMe: Converts into S-adenosylmethionine (SAMe), which supports immune function, cell membranes, and neurotransmitters like serotonin and dopamine.
- Produces antioxidants: Converts into L-cysteine to help form glutathione, a key cellular antioxidant.
- Animal sources: Meat, poultry, fish, eggs, and dairy products.
- Plant sources: Soy foods, Brazil nuts, sunflower seeds, black beans, and cashews.
- Medical use: Used in clinical settings to treat acetaminophen (Tylenol) overdoses to help prevent liver damage.
- Supplementation: High doses or supplements can raise homocysteine levels and may be unsafe for people with severe liver disease, MTHFR deficiency, or bipolar disorder.




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