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With oral vitamins it can take days or weeks of daily dosing to build up the same effect
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
PubMed, Park, Hyo-Hyun, Soyoung Lee, Hee-Young Son, et al
The duration depends on your health goals and your doctors recommendation, but many protocols run for 24 to 48 weeks with gradual dose increases
