It's true. Capsaicin is a specific for treating arthritis. But for many people it's better to apply it topically in the form of salves or infused oils. For internal treatment, alfalfa makes more sense for most people. (among other things, I'm a practicing family herbalist)
The one thing to keep in mind, with chilis, is the intended effect. For most people, who use them for culinary purposes, what's wanted is a contribution to the dish being made. That could consist of flavor, or pungency, or a combination of the two.
For medicinal purposes, chilis serve a different function. Even when taken internally, the person taking the remedy isn't concerned with what it tastes like; only that it help fix what's wrong. And that person might be willing to accept certain side-effects and contraindications to affect a cure.
And for chiliheads like furi, all that matters is the burn, and the resultant endorphin rush that follows. The ultimate, for those folk, would be to drink a capsaicin tincture, which, when properly made, comes in at 1,000,000 SHUs. You start saying that: "One million...." Unfortunately, the survival rate of people who drink it isn't all that great. :(
BTW, Furi, for seed availability, check with Heritage Seed Curators Assn., PO Box 113, Lobethal, SA 5241, 08 8389 8649, han.HSCA@b150.aone.net.au
or Seed Savers' Network, PO Box 975, Bryon Bay 2481, 02 6685 6624, firstname.lastname@example.org
. Those are the two national seed saving organizations in Australia, and they or their members are likely to have seed you can't get any other way.