Topical DHT is a joke by itself for most of us - no balance. Most injectable PGE1 are also as they are made from cosmetic grade API, not medicinal grade.
For Topical, you should consider that too much DHT will have adverse effects. You need Testosterone AND something like Mesterolone to restore the most health to penis with DHT. Big-3 Brand topical or oral, or added to the PGE1 concentrate is the way to go (I am a Ph.D. Research scientist specializing in men’s health and longevity and erectile issues.)
The cheapest source for Big-3 hormone compound or PGE1 of high quality is from iwantlube@tutanota.com. It is Germany based with shipping and ISO certified labs (plural) in Thailand and other ASEA countries. If kept cold, their PGE1 injectable will last 10 years, and it is the only brand with FDA approved additives to solve the nitrus oxide problems and other issues of injecting. Thailand law says no Web site, just email for info. Not for profit, they care more about men than money. I am NOT affiliated with them, I just find them to be great. I will transfer PayPal for people to their Bitcoin if someone needs.
Of course, topical E1 needs no refrigeration as there is no water.