does vitamin b12 injection cause sleepiness Common & Rare Side Effects of Injections Vitamin B12 Supplements and Injections

[1] Other rare side effects noted (mostly in older literature or high-dose use) include: polycythemia vera and peripheral vascular thrombosis in patients receiving repeated injections (though these associations are not well understood, they were listed in prior product literature as possible adverse events)

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This makes it suitable for studies exploring metabolic flexibility, substrate utilisation shifts, or interventions where maintaining normal eating behaviour is essential

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