What is the common name for Vitamin B3?

The common name for Vitamin B3 is niacin. This vitamin plays a crucial role in converting food into energy, aiding in the function of the digestive system, skin health, and the nervous system. Niacin is also known for its importance in the synthesis of hormones in the adrenal glands and for maintaining healthy cholesterol levels in the body.

Other options listed, such as thiamin, riboflavin, and proxidine, are different vitamins with distinct functions. Thiamin is Vitamin B1, which is essential for energy metabolism and nerve function. Riboflavin is Vitamin B2, important for energy production and skin health. Proxidine is not a commonly recognized vitamin and does not pertain to the B-vitamin complex. Thus, niacin is the correct and widely recognized name for Vitamin B3.