Which vitamin is essential for the conversion of tryptophan to niacin in the human body?

A Vitamin B6
B Vitamin B2
C Vitamin B3 ✓
D Vitamin B12

Explanation

Vitamin B3, also known as Niacin, can be synthesized from tryptophan in the presence of Vitamin B6, but it is Vitamin B3 itself that is crucial for this conversion process as it is the end product.

Source

Biochemistry textbooks
Vitamins Nutrition Niacin and Tryptophan Metabolism Easy MEDICAL Confidence: high