Which of the following vitamins is NOT fat-soluble?

Vitamins are classified into two categories based on their solubility: fat-soluble and water-soluble. Fat-soluble vitamins include Vitamins A, D, E, and K, which can be stored in the body's fatty tissues and liver. These vitamins require the presence of fat for optimal absorption and utilization in the body.

Vitamin C, on the other hand, is a water-soluble vitamin, meaning it dissolves in water and is not stored in the body. It needs to be consumed regularly through diet because excess amounts are not retained and are instead excreted in urine. This distinction makes Vitamin C the correct answer to the question regarding which vitamin is not fat-soluble. Understanding this classification is essential in nutritional science and sports medicine, as it emphasizes the different dietary requirements and metabolism of these vitamins.