Solar energy is a great source for vitamin D3
Soil is a great source of vitamin B12
Many seeds are a great source of DHA
There is nothing required by our bodies that is proprietary to the eating of animal carcasses.
Our bodies were not designed for that diet either- 
Your opinion, my opinion!
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@alan369 I am not a medical professional but from my observations after years of seeing people fall off a vegan diet, it is from lack of calories, not nutritional requirements. Usually a person will get so undercarbed eating 250 calorie salads that they end up at KFC.
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Do you really believe that pointing out sources of vitamins is an opinion? Or do you just tell yourself that to make you feel better about what you eat?
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I don't wanna argue with you
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