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David S. Klein, MD has practiced pain medicine for over 35 years and is the author of over 50 published articles and textbook chapters. He has lectured locally, nationally and internationally.  He is a member of the American Board of Anesthesiology, American Board of Pain Medicine, American Academy of Pain Management, American Board of Minimally Invasive Medicine & Surgery, and has Sub-Specialty Certification in Pain by the American Board of Anesthesiologists.

After many  years of medical research, study in nutritional medicine, and functional medicine,  combined with an intensive traditional medical background,   Dr. Klein has developed many unique and specific nutraceutical approaches,  reflecting the  patients’ age, gender, medical/surgical history, family history and environmental exposure, which then results in the ‘stage of life’ and ‘stage of health.’

We deliver ‘Precision Personalized Medicine.™

All nutraceutical products offered through Stages of Life, Inc. ® are manufactured to the highest certified quality (GMP®) and are free of soy and gluten.