does vitamin b12 injection cause sleepiness Common & Rare Side Effects of Injections Understanding the B12 Vitamin Shot:

Vitamin B12 shots are considered safe for most individuals and are commonly used to treat deficiencies and support overall wellness

[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)

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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