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B12 injections typically deliver about 1,000 mcg per dose, while oral supplements can range from 50 to 5,000 mcg

If fatigue is severe, sudden, or unexplained, bring it to your clinician B12 is one possible factor, but it's not the only one worth ruling out

Unlike many nutrients, B12 is produced exclusively by bacteria and obtained primarily through animal-based foods including meat, fish, eggs, and dairy products

Two popular options for supplementation are Vitamin B12 injections and oral supplements

Injections, on the other hand, are more efficient

People with busy schedules may prefer the convenience of monthly injections