Diatomaceous Earth does work, no question about that. Just use some
common sense when handling it. There is a lot of info on the Internet about it's properties, benefits and uses. Be sure to only use Food Grade for yourself, home, pets/livestock and garden. Don't eat DE that has bentonite clay in it. Once you start using it and learning about it, you'll wonder how you could have ever done without it.
As far as the capsule part, it is just that someone caught on that it works and thought, maybe for convience or whatever, someone would buy it. Capsuling just increased the retail cost, you'd do and get much better buying in bulk and taking or administering it by the spoonful. The usual dosage for a human adult is 1/2 to 2 tablespoons per day, that would be a lot of gelatin capsules to equal and a lot of gelatin in your stomach. If you don't drink an adequate amount of
water, like - half your body weight in fluid ounces (what everyone
should be drinking daily), you'll be constipated.