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27
2026
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04
New Scientific Discovery: Betaine May Emerge as a “Rising Star” in the Health Field
Betaine, chemically known as N,N,N-trimethylglycine, is an alkaloid with a quaternary ammonium structure, with the molecular formula C₅H₁₁NO₂ and a molecular weight of 117.15. Its chemical structure is similar to that of an amino acid; however, the presence of three methyl groups imparts strong polarity. It appears as a white crystalline powder, with a melting point ranging from 293 to 305°C, and is readily soluble in water and other polar solvents. In living organisms, betaine exists extensively in both free and bound forms.
From a metabolic perspective, betaine serves as a crucial methyl donor; via the catalysis of betaine–homocysteine methyltransferase (BHMT), it transfers a methyl group to homocysteine to produce methionine, a process that is essential for maintaining intracellular methyl balance. Clinical studies have demonstrated that daily supplementation with 1.5–6 grams of betaine can significantly reduce blood homocysteine levels, decrease the risk of atherosclerosis, and improve cardiovascular health. Its hepatoprotective mechanisms include stabilizing hepatic cell membrane structure and promoting lipid metabolism and transport; animal studies further indicate that long-term intake can elevate hepatic phospholipid levels, thereby counteracting liver injury induced by toxins such as carbon tetrachloride.
In osmotic regulation, betaine functions as a compatible solute, maintaining intracellular water balance through hydrogen bonding and thereby protecting enzyme activity and the structural integrity of biomolecules. This property makes it a key ingredient in sports nutrition, as it not only prevents electrolyte imbalances caused by dehydration but also attenuates post-exercise inflammatory responses by inhibiting TBK1 kinase. A study published in Cell by a team from Capital Medical University has further demonstrated that betaine can slow down the aging process across multiple organs.
In industrial applications, betaine derivatives exhibit a wide range of functionalities: alkylbetaine surfactants are low-irritant and resistant to hard water, making them widely used in detergents and fabric softeners; sulfobetaines remain stable under both strongly acidic and strongly alkaline conditions, rendering them suitable for oilfield enhanced oil recovery agents; and phosphate ester betaines, owing to their excellent emulsifying properties, are employed as metalworking additives. In agriculture, exogenous application of betaine can enhance crop stress tolerance—for example, by improving the germination potential of maize under low-temperature and drought conditions and by alleviating the inhibitory effects of salt stress on tomato photosynthesis.
In terms of safety, betaine is well tolerated at conventional doses; however, excessive intake may cause gastrointestinal discomfort or hypotension, and caution is advised for individuals with renal impairment. Natural dietary sources include beetroot, spinach, and goji berries, with beetroot containing the highest concentration of betaine in its sugar syrup, making it an excellent choice for dietary supplementation.
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