Can I still take a Saw Palmetto supplement (DHT blocker) if I'm taking finasteride 1mg daily?

For any doctor one of our key tenants is "Do No Harm". Both under and over medicating, or use of unregulated formulas can cause harm.
Both medical technology and knowledge have some a long way since the dark ages when medicine was practiced via trial and error, however it seems that many people (some doctors included) still prefer to practice that way.
Luckily we now have Precision Medicine (sometimes also called personalized medicine) which bases any treatment on a thorough diagnosis through detailed blood tests.
Before taking any kind of treatment for anything - and especially for hair loss which is actually a symptom of deeper underlying conditions and not a disease itself - we must first diagnose and understand the cause and all other contributing factors.
Please find a precision medicine doctor who specialises in hair regrowth and who will first perform detailed labs to understand exactly the treatment that you should have to both stop hair loss and to regrow your own natural hair.

Some patients do combine antiandrogens but one must be aware that the chances of side effects do increase. You’ll want to review the side effects of both finasteride and saw palmetto with your physician. Males taking both have an increased chances of side effects than patients using just one.