The title says it all really.

Are there any DHT Blockers / 5-AR Inhibitors / Anti-Androgens that are available without a prescription?

I already use Nizoral shampoo and Nioxin shampoo/scalp conditioner, but i feel i need to do more to reduce DHT on my scalp, as i believe that is the main reason for my hairloss and receding hairline.

I'd prefer topical products if possible, to avoid any systemic side effects.

Please, can anyone suggest ANYTHING else i could try to reduce DHT on my scalp?