Pharmacology The following statements regarding Vitamin D3 are true except: A Chronic injection of large doses can result in hypervitaminosis. B It is useful in postmenopausal osteoporosis. C Its active metabolite is calcitriol. D It is ineffective in the treatment of vitamin D resistant rickets. 💡 Explanation The following statements regarding Vitamin D3 are true except: ✓ Correct Answer: D. It is ineffective in the treatment of vitamin D resistant rickets.