Donald R. Yance, CN, clinical master herbalist and medical director at the Mederi Centre for Natural Healing in Ashland, Oregon, founder and president of the Mederi Foundation, a not-for-profit organization for professional education and clinical research in collaborative medicine, and president and formulator of Natura Health Products. He is author of Adaptogens in Medical Herbalism (Healing Arts) and Herbal Medicine, Healing & Cancer (Keats). DonnieYance.com
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