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4 Journal of Human Kinetics

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B12 is primarily found in animal-based foods such as meat, dairy, and eggs, and is absorbed in the small intestine after binding to a protein

Samir Sinha, who was not involved in the research, said B12 shots can't provide "a big boost." "Getting B12 shouldn't instantly make you feel great or more powerful," he said

Thiamine is critical in managing Wernicke-Korsakoff syndrome , a severe brain disorder often seen in people with alcohol use disorder