Here are some supplements you are likely to come across in your search for a remedy for hair loss
Nettle is often put into hair growth treatments. It allegedly works by blocking 5-Alpha-Reductase which is a chemical that makes the conversion testosterone and DHT occur. It is generally considered to be stronger than Saw Palmetto. It does have some negative interactions with prescription drugs, Especially if taking blood pressure medication
This the main ingredient for many hair loss treatments. It has become popular because it has a reputation for reducing DHT. Research has been done because it has been found that by reducing DHT prostate health can be improved. Reducing DHT has been suggested to improve hair loss. In an interesting correlation, Finasteride also called Propecia was originally created as being a prostate treatment and it is now potentially a hair loss treatment as patients who originally had issues with their prostate found that hair growth was being improved. The mechanism by which Propecia is working is via lowering of DHT, however it is not necessarily the case that Saw Palmetto will have the same efficacy as Propecia. Note also that Saw Palmetto as side effects and drug interactions and should be avoided by pregnant women and that for women it could be that it has little to no effect anyway.
Dong Quai works by blocking DHT. Within it has phytoestrogens, these block the androgen-receptor sites which help the process of changing testosterone to DHT. Due to its mechanism of blocking DHT it is believed that it may help prevent hair loss.
By combining all three of these you may have the best possible supplement regimen at a much more affordable price than many on the market currently. Always check for interactions.