Plant Guru buys our oils from top suppliers all around the world. We work directly with one of the most well-known, world renowned, essential oil experts. To guarantee continuous quality, The Plant Guru oils (each batch) are tested by a third party laboratory using GC/MS testing, as well as in house by our expert. This guarantees that all testing matches up and that nothing is missed. Each step of the process is overseen by our expert. All of Plant Guru Oils are 100% pure, undiluted and free from any additives, chemicals or pesticides. Learn more about our essential oils below.