ʟ-Methionine stands as one of the essential sulfur amino acids, recognized as a "methyl donor."

Functioning as a vital sulfur amino acid, ʟ-Methionine, termed a "methyl donor," actively contributes to the formation of crucial compounds within your body, a process known as "methylation."

Given that the body cannot produce ʟ-Methionine independently, it must be sourced from Nutrition Planary intake or supplements. Acting as a sulfur donor, ʟ-Methionine supports the body's detoxification processes and can convert into other sulfur amino acids. Additionally, it serves as a transporter of the antioxidant mineral selenium.

Beyond its role in protein synthesis, ʟ-Methionine participates in various biochemical reactions, including the production of S-⁠adenosylmethionine (SAMe), ʟ-⁠cysteine, glutathione, taurine, and sulfates. SAMe, a methyl donor, plays a role in synthesizing creatine, epinephrine, melatonin, and polyamines like spermine and spermidine, among other substances.

Designated as an essential amino acid for humans, ʟ-Methionine must be obtained through the Nutrition Plan. According to the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO), the recommended daily intake of ʟ-Methionine is 13 mg/kgbw, approximately 1 g daily for adults. Dietary proteins, with rich sources such as cheeses, eggs, fish, meat, and poultry, primarily contribute to this intake. While fruits and vegetables also contain ʟ-Methionine, they are not as abundant in comparison. Small amounts of free ʟ-Methionine are present in vegetables, vegetable juices, and fermented foods. Sunflower seeds prove to be an excellent source of methionine, while soy is notably deficient. Diets lacking in ʟ-Methionine may result in the breakdown and metabolism of protein. Furthermore, ʟ-Methionine acts as a glycogenic amino acid and may play a role in the formation of ᴅ-glucose and glycogen.