Does nutritional yeast count as a food or supplement?

noun /ˈsʌplɪm(ə)nt/ 1. a thing added to something else in order to complete or enhance it. "the handout is a supplement to the official manual"

Strength athletes supplement their training with tomatoes and curcumine plus pepper to decrease inflammatory response from training.

Bodybuilders supplement their training with protein powder to enhance sarcoplastic hypertrophy.

Polyglots supplement their studies by reading books in the language they want to learn.

Endurance athletes supplement their training by doing half repetitions at the end of the workout as cool downs.

Salt supplements the flavor of chocolate milk by making the sweetness stronger.