Biochemistry The vitamin B6 contained in plants is less bioavailable than that in animal tissues. Pyridoxine is required for: A Urea formation B Heme synthesis C Amylase D Lipoprotein lipase 💡 Explanation The vitamin B6 contained in plants is less bioavailable than that in animal tissues. Pyridoxine is required for: ✓ Correct Answer: B. Heme synthesis