Bryan Johnson· Author
compared to fish and poultry, red meat (sheep) has the highest bioavailability of vitamin B12, 42%, 61-66%, and 56-89%, respectively.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
compared to fish and poultry, red meat (sheep) has the highest bioavailability of vitamin B12, 42%, 61-66%, and 56-89%, respectively.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
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