The only problem I can see with Bryan's test is that you might be able to tell when you are eating the muffin with a finasteride tablet in it versus the muffins with no finasteride, which would make the test non-blind.
Another possibility might be something like this --
Smash up a Proscar tablet and put the resulting powder into a shotglass filled with vodka. Let it sit for a while so that the finasteride is dissolved. Then pour out the vodka evenly among 5 identical shotglasses, leaving the powder behind. Each of these shotglasses will then have about 1mg of finasteride in it. Then get 5 more shotglasses, identical to the first 5, and just pour vodka without finasteride into them, the same quantity of vodka that is in the first five. You can top off all ten shots so that they have the same amount of liquid in them. If powder got into any of the 5 finasteride samples then the test won't be blind, so you have to avoid that. Then do what Bryan said with having a friend number the glasses and bring you them one per day and record the results.
Actually, if you have a friend actually prepare the test samples without you being present, you probably don't even need to use identical containers to hold the 10 samples, as long as they all have the same amount of vodka in them.
Another possibility might be something like this --
Smash up a Proscar tablet and put the resulting powder into a shotglass filled with vodka. Let it sit for a while so that the finasteride is dissolved. Then pour out the vodka evenly among 5 identical shotglasses, leaving the powder behind. Each of these shotglasses will then have about 1mg of finasteride in it. Then get 5 more shotglasses, identical to the first 5, and just pour vodka without finasteride into them, the same quantity of vodka that is in the first five. You can top off all ten shots so that they have the same amount of liquid in them. If powder got into any of the 5 finasteride samples then the test won't be blind, so you have to avoid that. Then do what Bryan said with having a friend number the glasses and bring you them one per day and record the results.
Actually, if you have a friend actually prepare the test samples without you being present, you probably don't even need to use identical containers to hold the 10 samples, as long as they all have the same amount of vodka in them.