I use them in my eyelash growth serum which I make myself. I don't use straight castor oil, but I mix it with vitamin E oil and it's not that much. I love that they come with an insert that scrapes off excess when the brush is pulled from the tube. Fair warning: the bet is not made to go back. It's hard to reuse them. I wish they were easier to reuse. However, it is worth it. My lashes look great!
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