vitamin b12 injections side effects injection sore throat 🩺 Deficiency: Signs & Symptoms Vitamin B12 is essential What Does a B12 Shot

This timeline matches B12 pharmacokinetics: intramuscular methylcobalamin reaches peak serum concentration at 8-12 hours, but tissue saturation (particularly in the liver and nervous system) occurs over 48-72 hours as the vitamin is transported into cells and converted to active coenzyme forms (Andrs et al., 2018)

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Some researchers suggest it could someday offer a new approach to obesity treatment, while others caution that its long-term effects and safety profile are still unclear

Keep in mind this is one marker, and lowering it has not by itself been proven to prevent heart attacks or strokes