Each batch of our Sprays & Drops that we run is third-party micro-tested. In regards to potency testing, we test the initial formula batch to verify our master record is correct and then randomly thereafter, typically after every 3rd or 4th batch. It is not necessary to test every batch, since we work with previously verified vendors and raw material that we use for ingredients. Please reach out if you have more specific questions regarding our third-party testing!