Carnivore was the only thing that was able to fix my low b12....
Carnivore is Ketogenic!
New study out now shows the benefits of keto/carnivore for people trying to lose weight.
https://www.mdpi.com/2072-6643/17/6/965#
Print out a copy and take it to your doctor, because they don't know about this paradigm-busting study!

Discussion
Nutritional yeast is not a plant, but it's loaded full of B12 (all the Bs, in fact) and it tastes like nutty cheese flakes. Can this be included in such diets, or is that too omnivorous for ketogenics?
Prolly fine. But eggs and beef has more b12 in the right form.
For me I was low iron and b12 anemic. Tried infusion and b12 pills for over a year. Levels kept falling off a cliff. Iron infusion worked, but not b12.
Carnivore fixed it. That was 2 years ago and while I am meat first now I am not carnivore any longer, but my b12 is still fine.