noun
energy supplement; sports nutrition supplement
Refers to food or drink taken during endurance sports to replenish energy and nutrients, such as gels, bars, or drinks.
マラソン中に補給食を取るタイミングが重要だ。
The timing of taking an energy supplement during a marathon is important.
この補給食は消化が良く、すぐにエネルギーになる。
This sports supplement is easy to digest and quickly turns into energy.
栄養補助食品 is a broader term for nutritional supplements, not limited to sports use.
Compound of 補給 (supply, replenishment) and 食 (food, meal). The term is a modern coinage for sports nutrition products.