Olive oil, coconut oil or castor oil work great for me. I dip the tip of my finger in the jar/bottle . I read somewhere that the amount of oil on the finger tip works best as a serum.. This does not make my hair greasy and it adds shine as well . Leave in sprays don't add shine unless it has silicones, but that is an absolute no-no for me.
Hth

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HAIR TYPE -2a-b, black, mostly medium
CO WASH, RO-HE HH and ENLEVEN and GARNIER RANGE
CLARIFY- I use sulphate shampoos silicone free(diluted), vinegar rinses
DC-pure coconut oil, olive oil, sometimes a SMT
LI-aloe vera gel + castor oil
I'm currently at BSL, aiming for waist length.I'm a very impatient person, wish me luck
I love my flat iron, but I love my waves even more. :-D