> Should I run my own lab to test every product I use?

Subscribe to one of the companies that do independent lab testing of consumer products and/or supplements.

Also, buy some field guides. You should be able to find medicinal plants for almost any condition within a couple miles of wherever you live. Wild Edibles Forage is the best app in this category for iOS. (In this case whether or not the plant/mushroom actually treats the condition is irrelevant if you were already planning on purchasing the same thing from the store.)