Vitamin B12 injections are fast-acting because they bypass the digestive system and deliver the nutrient straight into the bloodstream
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B12 injections are injected into the muscle and dispersed over time, therefore bypassing the digestive tract, so you get much higher absorption than you would orally
According to clinical resources such as the Mayo Clinic, while B12 is essential for nerve and red blood cell health, theres no strong evidence that injections improve energy or aid weight loss in people without a documented deficiency
