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Some foods and medications may affect urine color, too

PMC 4453489

While the energetic effects fade after 2 to 4 weeks, vitamin B12 itself continues to be stored in the liver and can remain available for years

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

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