Keep in mind that essential oils are also great to add to you DIY hot oil treatment. Essential oils are very potent and have been known to help hair growth. Because they are so potent they cannot be used alone. Never try to do a hot oil treatment with only essential oils. You can potentially burn your skin and that is why they should always be added to a carrier oil. I would say about 10 drops of essential oil per ounce should suffice. My all time favorite essential oils that I love to use for hair care is rosemary, peppermint, sage, tea tree, cedarwood and lavender. This blend of oils mixed with carriers is a powerhouse.