A, B and C, e.g. (8)

I believe the answer is:

vitamins

(Other definitions for vitamins that I've seen before include "Organic compounds essential for growth and nutrition" , "They're essential to normal metabolism" , "They're essential for growth" , "Essential substances found in strange mini vats" , "Nutrition supplements" .)

I've seen this clue in the King Feature Syndicate.

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