Biochemistry Which of the following is the major circulating form of Vitamin D? A 25-(OH) D3 B 1, 25-(OH)2 D3 C 24, 25-(OH)2 D3 D 1, 24-(OH)2 D3 💡 Explanation Which of the following is the major circulating form of Vitamin D? ✓ Correct Answer: A. 25-(OH) D3