That's not a list of nutrients that can only be animal-derived. It's a list of nutrients that are rarely (or never) found in plant foods. Vitamin B-12, for ins

That's not a list of nutrients that can only be animal-derived. It's a list of nutrients that are rarely (or never) found in plant foods. Vitamin B-12, for instance, is bacteria-derived. It's easy to obtain via supplements and fortified plant-based foods.