A long time ago, my parents stumbled across the medicinal properties of Goldenseal. Last year, during the rainy Oregon winter, a 1/2 feral litter of kittens started trying to find shelter on my porch. Not long after they started coming around, the mother left them (went into heat i assume) and came back with a hellish upper respiratory infection. She proceeded to spread it to the whole litter. I had no money to take them to a vet, and they were dying of it. I wasn't sure if the Goldenseal would be poisonous to them, but I figured they were so bad off, it was worth a try. I used the liquid extract, started small, maybe one dropperfull to two cans of wet food, and eventually raised it to 3 droppersfull (between 1 adult and 5 3-4 month old kittens). They improved from even the smaller amounts, and improved drastically from higher dosages. Although for those that couldn't smell the wet food, i had to mix a few drops in canned salmon or tuna juice to get them to eat it. It didn't harm them. I swear by the stuff now, and have used it on my own indoor cats (though I've never gotten them to take it without forcing them.) Everyone should be aware that goldenseal doesn't just work on humans.