The belief "veganism is natural for humans" is not harmless. There don't seem to be any bioavailable plant-based sources of b12. If you were to live that belief, you can get permanent nervous system damage

"There is only one reliable test for a B12 source - does it consistently prevent and correct deficiency?"

A more extensive article from former vegan Chris Kresser:

"A study from Tufts University found that 40 percent of people between the ages of 26 and 83 have plasma B12 levels in the low normal range, a range at which neurological symptoms can occur"

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aaa wtf he recommend a dose 5x higher than what I'd get from the average pill here (he recommends at least 250mcg) but doesn't cite that part

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Dr Greger advocates 50mcg on one page and 250mcg (or 2500mcg weekly) on another
I'm gonna call it for 250 I guess

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@faun My understanding is that many recommended doses are spitball and convention. How much stock do you put into this guy's words? B12 is water soluble so I'd think high dosage recommendations could be made rather flippantly, but it's not a topic I'm very familiar with.

@bee because he didn't cite anything (therefore hate) I'd be willing to dismiss him for dr greger right now, but I think greger agrees with him (at least, has. I can't tell what the chronology is between the two things greger has said)

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