How about a deep conditioner using one ingredient?
Simply heat 3 to 5 tablespoons of olive oil in a heat safe container or in a glass mostly submersed in water on the stove top. Keep the temperature lukewarm for application.
Apply oil to the root end first and work it through with your fingertips. The longer your hair, the more oil you will need.
Wrap hair with a warm, wet towel and leave oil in for 20-30 minutes. Shampoo well when finished.
This treatment can be done twice a month for optimal results. Don't have olive oil handy? You can also use jojoba, almond, sesame, avocado or argan oil.
Ref: Harju, Debra; How to Deep Condition Hair with Olive Oil; Hello Glow Website; Accessed 05/23/16 http://i.iherb.com/MQ7J