Before Leave-In's, there was Oil Moisturizer. During my relaxed hair life, oil moisturizers worked great on my dry hair. I'd just use a bit to smooth my hair and add shine. Most of them have water as an ingredient (usually the first ingredient) and that provided enough moisture to smooth my relaxed hair. Now, I use oil moisturizer on my wet/damp, natural hair as a leave-in. These days, the moisturizers are formulated with nourishing oils, in addition, to mineral oil which doesn't bother me. I also use it as a sealant and as a heat protector when I use my diffuser. Oil moisturizers are usually quite affordable and last a long time. The key for me is to use a minimal amount and use on wet hair. Two "likes" are Elasta QP Recovery and Cantu Shea Butter daily oil moisturizer.