vitamin b12 injections before chemotherapy Timing of folic acid/vitamin supplementation and hematologic toxicity during first‐line treatment of patients with nonsquamous non–small cell lung cancer using pemetrexed‐based chemotherapy: The PEMVITASTART randomized trial - Singh MIC+B12 | Energy + Mood
Description
It binds to transport proteins, primarily transcobalamin II , which delivers B12 to tissues throughout the body

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An elevated methylmalonic acid (MMA) level has been thought to be the most direct, metabolic indicator of B12 deficiency because B12 is the only cofactor required by the enzyme that degrades MMA
