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Some of the serious symptoms of a B12 deficiency include tinnitus, severe joint pain, memory problems, depression, anxiety, impaired muscle function, ataxia, changes in reflexes, and even infertility
Both these methylation reactions are vital for growth and cell reproduction.[9][10] Methionine, a sulfur-containing, essential amino acid, is a precursor of S-adenosylmethionine, a cofactor for one-carbon metabolism and the final methyl donor for the methylation of DNA, RNA, proteins, and phospholipids.[11] The methionine synthase plays a paramount role in the synthesis of nitrogenous bases (purines and pyrimidines) involved in the formation of DNA
Vitamin B12 shots are injections administered directly into the muscle by a healthcare professional
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