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Using expired B12 can result in decreased efficacy and be unsafe for your health

Low-dose oral minoxidil is the latest off-label option, though it has some question marks surrounding blood

Toxicity is extremely rare, but injections should still be given under professional guidance

Babula JJ, Bui D, Stevenson HL, et al

Doctors and health media focus almost entirely on B12 deficiency, so seeing a number flagged as high can feel unexpectedly alarming

How Fast Does a B12 Shot Work Compared to Oral Supplements Because B12 shots are administered intramuscularly and absorbed directly into the bloodstream, the nutrients bypass the slow digestive process