Moisturizing shampoo ingredient (4)

I believe the answer is:

aloe

(Other definitions for aloe that I've seen before include "Fleshy-leaved plant" , "has a bitter taste" , "Succulent plant (4) 5532" , "Succulent plant (may be bitter!)" , "Bitter drug from a leaf juice" .)

I've seen this clue in the USA Today.

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