Self Directed IRA loan to yourself?

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Hi all, I'm reading a book right now and they mentioned possibly getting a loan from a family member and suggested having them utilize their self-directed IRA to loan out the cash. I'm just thinking out loud, but does anyone know if you could do a self-directed IRA loan to yourself without any tax implications if you had terms to pay your IRA back with interest? I'm assuming there must be something prohibiting it but thought I'd throw this post out here to see if anyone knew. Thanks!