What is vitamin D and how is it produced in the body?
Vitamin D is technically a prohormone, not a vitamin. It is produced in the skin when UV-B radiation interacts with 7-dehydrocholesterol, leading to its conversion in the liver and kidneys into its active form, 1,25-dihydroxyvitamin D, which targets virtually every cell in the body via vitamin D receptors.
✦
This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
Read The Willpower Lie →Found an error? Let me know →