Biochemistry Which of the following is the most important vitamin D precursor? A Alfa-calcidiol B 25 Hydroxy-cholecalciferol C Ergostrol D 1-25 dihydroxy cholecalciferol 💡 Explanation Which of the following is the most important vitamin D precursor? ✓ Correct Answer: B. 25 Hydroxy-cholecalciferol