Biochemistry In humans, the end product of purine metabolism is uric acid. End product of purine metabolism in non-primate mammals is: A Uric acid B Ammonia C Urea D Allantoin 💡 Explanation In humans, the end product of purine metabolism is uric acid. End product of purine metabolism in non-primate mammals is: ✓ Correct Answer: D. Allantoin