Can you take bioidentical hormone replacement therapy while you still have periods ?

No, not a good idea: It is not a good idea to take anything with hormonal effects that is not an fda approved drug, because non-approved drugs may or may not have correct ingredients nor pure ingredients, and the advertised effects may or may not occur in humans, plus the side effects are usually uncertain and unadvertised. If one wants to use hormones, use the pure, tested, and regulated ones a doctor can prescribe.

Replacing what?: If you're still having periods, then you're making your own hormones and not needing to replace them. Birth control pills can be used to help regulate irregular periods. Bioidentical hormone replacement is used in post-menopausal women who are no longer making their own hormones.

What needs fixing?: It depends on what you are trying to fix. If you are having problems with pms, low libido, vaginal dryness etc you may still benefit. There is no magic formula. You need a doc that understands what is bothering you and is willing to see you often enough to tweak your treatment. Diet, exercise sleep, thyroid and many other things have to be evaluated at the same time. It's not simple, but it works!

Yes. : Whenever you start suffering with menopausal symptoms of estrogen or Progesterone deficiency, you may start to use bioidentical hrt. This may be several years before your period stops completely.