I would definitely recommend coQ10 for you. I haven’t heard it used for MF, but I’m not familiar w/ vitamins for MF. I’ve had 3 different RE’s recommend CoQ10. 200 mg 3 times per day. I’ve never had any side effects from it. I would use for at least 3 months before a cycle and my current RE had me use it while stimming. I took coq10 when trying to conceive my first child and got lucky the first IUI cycle after I had taken them 3 months. I have been taking lower doses while pregnant and after he was born (200 mg per day) and then ramped up again before this last IVF.
As for dhea, my current RE had me take it while stimming (25 mg 3x per day) but I haven’t used it otherwise. If you search, I’m sure you will find more discussion. I’ve heard it’s not good to take if you are PCOS. Also, it can have side effects that just vary by the person. From acne, hair falling out, not sleeping, to angry rages. But some people don’t notice anything. I wasn’t on it long but I noticed very greasy skin.