Has anyone had success treating androgenic hair loss topically?

My wife was recently diagnosed with androgenic hair loss (likely related to PCOS). Her hair line at the front of her head has moved back about an inch. She unfortunately can't take oral medications because they conflict with other meds/health issues and she's worried topical treatments won't be effective. Does anyone have any experience with this or any topical treatments you can recommend? She is still waiting to hear if she could take a supplement like pumpkin seed oil, so experiences with that might be helpful as well.