Which of the following is an example of a performance supplement?

Creatine monohydrate is classified as a performance supplement because it is specifically designed to enhance athletic performance and exercise capacity. Creatine works by increasing the production of adenosine triphosphate (ATP), which is the primary energy carrier in cells during high-intensity, short-duration activities such as sprinting or weightlifting.

When athletes supplement with creatine, they may experience improvements in strength, power output, and muscle recovery. This makes it particularly popular among those engaged in resistance training and high-intensity sports.

In contrast, the other options, while beneficial in various ways, do not primarily focus on enhancing athletic performance in the same direct manner as creatine. For example, protein powder is typically used for meeting dietary protein needs, fish oil is often taken for its omega-3 fatty acids and overall health benefits, and multivitamins provide a range of nutrients to prevent deficiencies rather than specifically targeting performance enhancement.