why are b12 injections given The Shot: What Every Human Needs to Know About Injectable Vitamin B12 Do You Need a Prescription

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Key Takeaways Vitamin B12 itself does not act like a laxative

While everyones body responds differently, many people notice a positive change in their energy and mental clarity within 24 to 72 hours

Once weve got your levels back up, youll shift to a maintenance dose

Injections, on the other hand, provide high bioavailability and typically result in faster improvement of symptoms Injections may be a better choice if: Youve been diagnosed with a B12 deficiency You follow a vegetarian or vegan diet You take medications that impair absorption You want faster, more noticeable results Ideal B12 Injection Dosage & Frequency Theres no one-size-fits-all dosage for B12 injections