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Shannon says: I have been using coconut oil for a while and I feel my hair is stronger than it used to be. I’d like to keep using it and I want to add olive oil to make my hair shiny, but I’m worried that mixing the two oils will stop the coconut oil from penetrating. Is it OK to mix two oils on my hair?

Yes, studies have shown that coconut oil actually penetrates the hair to help make it stronger. And as it turns out, olive oil also has penetrating properties. Scientists at the Textile Research Institute tested olive oil, avocado oil, meadowfoam seed oil, sunflower oil and jojoba oil. Their results showed that straight-chain glycerides like olive oil easily penetrate into the hair. Polyunsaturated oils, like jojoba oil, are more open in their structure so they don’t pass through the layers of cuticles very well.

What does that mean in plain English? Olive and avocado oils penetrate all the way into the hair shaft. Meadowfoam seed oil partially penetrates, and jojoba and sunflower oils don’t penetrate at all. They’re very superficial and don’t really provide any practical benefit.