subq b12 injection Best Vitamin Sites: Where to Inject B12 · PA Relief How SubQ Injections Like B12
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The deltoid (upper arm) is also an IM site but can be harder to reach on your own

Comprehensive safety studies spanning six months in rats (up to 100 mg/kg/day) and nine months in cynomolgus monkeys (up to 50 mg/kg/day) revealed no adverse findings, with NOAEL reaching the highest applied dosages

They may recommend a blood test to confirm if you have a deficiency

Classic B12 deficiency
