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Intramuscular B12 injections produce faster results than oral supplementation, with reticulocytosis typically beginning by day 34 of treatment

In vitro studies show that downstream markers can vary sharply across cell type and tissue context, which is why reproducible sourcing and storage matter at the procurement stage

One friend got super-shredded within 2 months despite eating less than stellar non-stop

B12 injection shots can usually be felt within 24 hours (and a change should show in blood tests after a month or two) A high dose of B12 oral supplementation takes the same time as an injection: roughly 24 hours to feel an improvement and then up to 2 months to show in blood markers

These studies clarify that vitamin B12 does promote weight loss