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Intramuscular and subcutaneous are not interchangeable, and the needle follows the route
Below are some of the top sites for B12 injections: Vastus Lateralis (Outer Thigh): Ideal for Self-Administration The vastus lateralis, located on the outer part of the thigh, is one of the most commonly recommended sites for self-administered Vitamin B12 injections
The Absorption Challenge: Research published in the American Journal of Clinical Nutrition reveals that absorption rates for oral B12 vary dramatically based on individual factors
However, how quickly you see these results depends on how you take B12
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