B-12 comes from topsoil (and eating plants that weren't stripped clean was how we used to get it naturally) and D can be made from the sun if you go outside.
How does one get B-12 or D from any food? They are artificially added these days. Animals just eat them from foods that are artificially fortified with B-12, so eating an animal is getting it artificially second-hand, along with all of the problems that come with eating animal-based food.
We get enough Vitamin D by being out in the sun for 15 minutes every few days.
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