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chakarera wrote

Reply to comment by deleted__ in by ziq

https://veganhealth.org/vitamin-b12/

The bacteria that produce kombucha, tempeh etc don't produce b12, it's possible in DIY style setups b12 producing bacteria is present from contamination. In communities were people ate vegan diets and believed they got enough b12 from fermented foods or soil or whatever, some develop deficiency, some don't, there's no known reliable non-animal source besides supplements. Considering how cheap and easy it is to supplement and the serious harm from deficiency it's irresponsible to not recommend vegans supplement b12.

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[deleted] wrote

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chakarera wrote

https://veganhealth.org/b12-status-of-raw-foodist-vegans/#Finland

In a study of some people consuming 2kg a day of home made ferments, half developed b12 deficiency. It seems in theory we should be able to get enough b12 from ferments and seaweed and stuff but they also contain ineffective b12 analogues so it's hard to study and we don't really know how to reliably get enough b12 on a vegan diet without supplementing.

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