L-methyl-B6-B12 is a drug used in the treatment of folate deficiency and vitamin B12 deficiency. Often, these deficiencies go hand-in-hand, something determined by your prescriber. L-methyl-B6-B12 may also be used for purposes not listed here.
L-methyl-B6-B12 works by mimicking the effects of folate in the body. L-methylfolate is, for example, the naturally circulating form of folate in the body. By giving patients L-methyl-B6-B12, it serves to replenish lost stores of folate and, by extension, help patients with vitamin B12 deficiency caused by a lack of folate.
There are a limited range of potential side effects with L-methyl-B6-B12, among them including nausea, headache, and tingling sensations in the hands and feet.