Which of the following is NOT considered a water-soluble vitamin?

Vitamin A is classified as a fat-soluble vitamin, whereas the others listed—Vitamin C, folic acid, and niacin—are all water-soluble vitamins. Water-soluble vitamins dissolve in water and are generally not stored in large amounts in the body; they are excreted through urine, which means they need to be consumed more regularly to maintain adequate levels.

In contrast, fat-soluble vitamins, such as Vitamin A, are absorbed along with dietary fats and can be stored in the liver and fatty tissues. This characteristic impacts how the body utilizes these vitamins and dictates different dietary requirements. Understanding these classifications is essential for nutrition and health, as it guides both dietary choices and potential vitamin supplementation.