Aloe Vera and Herbs in the Wild

Dr Schultz suggests using live Aloe Vera. Nurseries sell aloe vera plants with large green prickly fronds. Would the aloe vera sold at regular nurseries be nutritious and safe to eat?

Also, on the same subject . . . what is the best way to learn about finding herbs growing in the wild to use in tinctures? When I look at pictures in books . . . it is hard to tell variations in plants.

Thanks
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