How, from dry grass, vitamins coming out? Nowadays the physician prescribes some artificial vitamins for maintaining your body. Now, what is the vitamin there in the dry grass so that the cow is eating dry grass and giving you nice milk full of vitamins A and D, essential for your life? So these are all wrong theories, that "This contains this vitamin. This contains this." Let them go on. But natural foodstuff which is meant for human being, they are full of vitamins already there by nature's law, by God's wish. So annād bhavanti bhūtāni (BG 3.14).
You will be surprised. When I was family man, I had a servant who was only twenty-two years old. Oh, he was too stout and strong. You see? So one day I asked him that... His name was Buddhu. So I asked him, "Buddhu, what do you take that you are very stout and strong?" He said, "My dear sir, I take only these corns." Corns. You know corns? A corns and it is powdered. The powdered portions used to make bread, and the grain portion he used to cook as rice, and he was taking that. That's all.