Which of the following statements about Vitamin B3 is not true?

Vitamin B3, also known as niacin, is indeed involved in numerous physiological processes, but it does not play a direct role in regulating phosphorus in the blood. Instead, its key functions include helping to lower cholesterol levels, supporting skin health, and being essential for energy metabolism.

When it comes to cholesterol management, niacin has the ability to increase levels of high-density lipoprotein (HDL) cholesterol while lowering low-density lipoprotein (LDL) cholesterol and triglycerides, contributing to cardiovascular health. Furthermore, Vitamin B3 supports skin health by preventing conditions like pellagra, which can manifest as dermatitis. Regarding energy metabolism, niacin is a crucial component of coenzymes involved in the conversion of carbohydrates, fats, and proteins into energy.

Therefore, the statement regarding its role in regulating phosphorus is not true and highlights a misunderstanding of the vitamin's functions in the body. This helps clarify that while Vitamin B3 is vital for various metabolic processes, its connection to phosphorus regulation is incorrect.