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Hi Simba,
thanks again for elaborating!
Can't really watch those videos though to be honest as that guy's voice is just making my head hurt unfortunately.
Vitamin B12 can only be produced by bacteria.
It cannot be produced by any yeast cells. So if there is some B12 in nutritional yeast or in beer, it is always added or due to bacterial contamination in the production which is highly unlikely.
Some of the other B vitamins can be produced by yeast, but not B12...so I did actually contact the brewery and asked them about this; here's what they tell me:
Unsere Weißbierspezialitäten werden nach dem Bayerischen Reinheitsgebot hergestellt, weshalb wir nur die Rohstoffe Wasser, Weizen- und Gerstenmalz, Hefe und Hopfen verwenden. Im Falle von ERDINGER Alkoholfrei wird außerdem noch die aus dem Brauprozess gewonnene Gärungskohlensäure als Zutat genutzt. Zusätze, z. B. von Vitaminen, sind nicht erlaubt, weshalb die wertvollen Vitamine in unseren Weißbieren von Natur aus enthalten sind. Das Vitamin B12 in ERDINGER Alkoholfrei wird über den natürlich vorkommenden mikrobiellen Besatz auf Weizen und Gerste bzw. Malz gebildet. Für dieses Vitamin B12 wurde durch renommierte Wissenschaftler eine Bioverfügbarkeit beschrieben.
"Our wheat beer specialties are made observing the bavarian purity law (...) which forbids adding supplements, including vitamins (...).
The vitamin B12 in Erdinger alcohol-free wheat beer is formed by microbial growth on wheat, barley and malt.
Renowned scientists have attested the bioavailability of this vitamin B12"
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salad
Simba
I understand.
The important differentiation here is yeast and bacteria. They are not the same.
Vitamin B12 can only be produced by bacteria.
It cannot be produced by any yeast cells. So if there is some B12 in nutritional yeast or in beer, it is always added or due to bacterial contamination in the production which is highly unlikely.
Some of the other B vitamins can be produced by yeast, but not B12.
You mention the 0,65mcg and I’m guessing you see that in relation to the current EU (it will likely change very soon) daily recommendation of 2 mcg, so my numbers doesn’t add up or seem exaggerated, but that’s due to how the receptor system works.
Apart from 500mcg daily and 2500mcg once a week there is also the option of eating fortified foods.
The easiest, cheapest and safest way is to eat a supplement.
Here are some videos to check out.
https://nutritionfacts.org/video/safest-source-of-b12/
https://nutritionfacts.org/video/cheapest-source-of-vitamin-b12/
https://nutritionfacts.org/video/daily-source-of-vitamin-b12/