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My experience with David Winston’s online clinical herbalism course was fantastic! David is thorough, professional and honest about his knowledge and experience with the herbal world. The Materia Medica was extensive and very comprehensive. His ability to compile massive amounts of clinical and historic information on the uses, contraindications, dosages along with climate and anecdotes on the 100’s of herbs in the materia medica is a continued wonder to me. I honor his dedication to the preservation and expansion of Herbalism and over the 3 years of study with him have grown to trust his opinion which was always clearly stated if it was either his opinion and/or based on some experience or clinical trials. His clarity and dedication is to be commended. I highly recommend this course.