nutritional supplement; nutrient tonic
Refers to products taken to supplement nutrition, such as tonics, drinks, or pills, often for health maintenance or recovery.
疲れたときに栄養剤を飲む。
I take a nutritional tonic when I'm tired.
栄養剤 usually refers to a liquid or drinkable nutritional tonic, whereas サプリメント typically means tablets, capsules, or powders taken as dietary supplements.
elemental diet formula; elemental nutritional supplement
Compound of 栄養 (nutrition) and 剤 (medicine, preparation).