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B12 injections deliver the vitamin directly into the bloodstream for immediate, reliable absorption

Chemistry: A European Journal

Vitamin B12 Absorption and Mature Athletes Defy Age with Vitamin B12: The Surprising Nutrient Key to Staying Active and Energized as You Get Older Published June 4, 2024 Aging is no excuse to stop exercising and eating healthfully

Nieskens TTG, Peters JGP, Schreurs MJ et al (2016) A human renal proximal tubule cell line with stable organic anion transporter 1 and 3 expression predictive for antiviral-induced toxicity

If that doesnt happen, some people may experience flu-like side effects such as fever, chills, headache, and nausea

Clinical laboratories generally define vitamin B12 deficiency as a serum level below 148 pmol/L, which is approximately 200 pg/mL