Ladies..jus curious if you could only pic one hair product what would it be and why?

[netnet26]

Hey guys I was jus curious as to finding out what one product you would pick and keep over the others and why.....? What is your most valued hair care product??

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4a relaxed/color treated/ fine
Currently: APL
2nd Goal: BSL (3/08)
Ult. Goal: WL ( By my 30th B-Day..in 4 yrs)