I made a hair serum today. I used Jojoba oil because its stable and doesnt feel so greasy, castor oil because it softens and shines for a long time, watermelon seed oil because its stable, not greasy and a good selling point, vitamin e because it will help the castor oil and is also a good selling point. For course african american hair. .15 watermelon seed .90 castor .90 jojoba .05 vitamin e packaging will be in a 2 oz bottle with orifice I tried it and waiting to see how it turns out . does anyone have an opinion? Would love to hear it.