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Another study indicated that even moderate consumption of alcohol among healthy, well-nourished, postmenopausal women results in a reduction of vitamin B12 by at least 5%

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In May, the MHRA and the ASA published an Enforcement Notice which makes clear to businesses which offer vitamin shots the nature of the rulings and directs them to remove any COVID-19 related claims from their websites and social media pages

Retrieved 20 February 2020

It's not so much that medics have a misunderstanding about B12 being available from liver stores in PA, so much as that, as far as I'm aware, the process of B12 mobilization from the liver is just not well understood