You can get the 1.87% horse paste from Tractor Supply and Amazon. You can also get the cream at Walmart. Various pet supply company online, such as Valley Vet. I'm told the horse paste is more pure than the pharma version for humans. I've been taking it for over a year with no problems. Parasites are the main cause of most everything and we all have parasites, especially if you have have pet or live stock!