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Correcting B12 changes your metabolism and nervous-system signalling, and that adjustment itself can feel like tiredness, lightheadedness or a vague off feeling before things settle
injections are chosen for rapid repletion or malabsorption
Inorganic donors like sodium sulfide have rapid oxidation and uncontrolled release, while organic donors such as GYY4137 offer more stability but still face issues with dose control and toxicity
Namely, it is always applied alone (Sikiric et al., 1993
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