Meet Our Experts

Nathan Morris, MD⁺

Nathan Morris, MD, is the Chief Medical Advisor of Pure Encapsulations^®. He resides in Monument, CO, where his multidisciplinary functional medicine practice, Good Medicine, focuses on making the complex simple. Dr. Morris is certified by the Institute for Functional Medicine and has practiced root cause medicine for over a decade. Dr. Morris is excited about the future of personalized medicine and its evolution as it empowers patients to understand their uniqueness and strengths.

Leslie J. Bonci, MPH, RDN, CSSD, LDN, FAND⁺

Leslie J. Bonci, MPH, RDN, CSSD, LDN, FAND, is a registered dietitian and board-certified specialist in sports dietetics. She was the sports nutrition consultant for the Kansas City Chiefs, is a lecturer at the University of Pittsburgh, the founder of Active Eating Advice, a nutrition consulting company and a co-founder of Performance 365, a sports nutrition consulting company.

Peter Bongiorno, ND, LAc⁺

Peter Bongiorno, ND, LAc, is dedicated to bringing effective holistic healing to the practice of mental health. In 2004, he established two thriving practices NYC Integrative, in New York City and Long Island. Prior to earning his naturopathic doctorate from Bastyr University, he researched at the National Institutes of Mental Health and Yale University, studying stress and the HPA axis. He authored the first integrative medicine textbook for depression in 2008. He has written numerous publications since then including three more books on mental health, including the essential How Come They're Happy and I'm Not?

Amy Doyle, MS, CNS^*

Amy Doyle, MS, CNS, is a board-certified Nutrition Specialist and the owner of White Stone Wellness, a private practice in Fayetteville, NY. She received her master’s degree in Applied Clinical Nutrition from the Northeastern School of Health Sciences in 2014. In addition to her practice, Amy also works in various capacities as an educator and content writer for the nutrition and integrative medicine world. Amy uses a personalized, whole patient focused approach to assess and empower individuals to achieve their best health and vitality.

Felice L. Gersh, MD⁺

Felice L. Gersh, M.D. is an award-winning physician, board-certified in both OB/GYN and Integrative Medicine. She has special expertise in the use of female hormones, the impact of environmental toxicants on metabolic and reproductive functions and on all aspects of lifestyle medicine. She graduated from Princeton University and the University of Southern California School of Medicine. She completed her OB/GYN residency at Kaiser Hospital in Los Angeles and was fellowship-trained in integrative medicine at the University of Arizona School of Medicine. Dr. Gersh is the Medical Director of the Integrative Medical Group of Irvine and helped co-develop the PureWoman^™ exclusive.

James Greenblatt, MD⁺

James M. Greenblatt, MD, has been treating patients and pioneering in the field of integrative medicine since 1988. He was Chief Medical Officer at Walden Behavioral Care in Waltham, MA for 21 years and is an Assistant Clinical Professor of Psychiatry at Tufts University School of Medicine and Dartmouth College Geisel School of Medicine. Dr. Greenblatt regularly lectures on the scientific evidence for nutritional interventions in psychiatry, has authored eight books and founded Psychiatry Redefined, an educational platform dedicated to personalized, evidence-based treatment of mental health. Dr. Greenblatt helped co-develop the PureSYNAPSE^™ exclusive.

Kelly C. Heim, PhD^*

Kelly C. Heim, PhD, is a Senior Consultant of Medical Affairs at Pure Encapsulations^® and Founder and Senior Science Editor at Integrative Pharmacology. He received his doctoral degree in pharmacology from Geisel School of Medicine at Dartmouth College and specializes in the pharmacology of natural compounds. Dr. Heim is a published author and illustrator of various studies, scholarly reviews and book chapters. He offers complementary learning resources on the basics of clinical pharmacology of natural products via his website, IntegrativePharmacology.com.

Daniel Kalish, DC⁺

Daniel Kalish, DC, founded the Kalish Institute in 2006 and has educated and empowered functional medicine providers around the world through his coursework and mentorships. His clinical experience spans over 30 years and includes the care of tens of thousands of patients. Dr. Kalish developed specialized GI lab interpretation models that maximize clinical effectiveness under the scientist who first developed the microbiome assessment, Richard Lord, PhD. He is also the author of three books, a notable speaker at functional medicine conferences across the United States and helped co-develop the PureGI^™ exclusive.

Penny Kendall-Reed, ND⁺

Penny Kendall-Reed, ND, is a naturopathic doctor in Toronto, Canada. After graduating from McGill University in Neurobiology, she earned a degree in Naturopathic Medicine from the Canadian College of Naturopathic Medicine, where she received the Dr. Allen Tyler Award for Most Outstanding Clinician. She is the author of six national bestselling books, was voted Naturopath of the Year in 2013 and “Top Naturopathic Doctor” in Canada in 2018. She is the creator of the integrated genetic platform GeneRx.ca and Director of Natural Therapies at the PKR Health.

Angela D. Mazza, DO, ABAARM, FAAMFM, ECNU⁺

Angela D. Mazza, DO, ABAARM, FAAMFM, ECNU, is a renowned thyroid specialist and triple board-certified in Endocrinology, Internal Medicine and Anti-Aging and Regenerative Medicine. She is founder of the Metabolic Center for Wellness in Oviedo, FL, the only center in Central Florida offering radiofrequency ablation procedures. Dr. Mazza is passionate about helping her patients achieve metabolic and hormonal balance and empowers each of them to achieve their unique goals through targeted interventions and lifestyle management. Dr. Mazza is author of Thyroid Talk: An Integrative Guide to Thyroid Health and hosts the podcast "Thyroid Talk with Dr. Angela Mazza."

Chris Oswald, DC, CNS^*

Chris Oswald, DC, CNS, is Head of Medical Affairs for Pure Encapsulations^®. He is a chiropractor, certified nutrition specialist and certified functional medicine practitioner and has been treating patients since 2007. His clinical work, in combination with his work in professional dietary supplement companies, gives him unique insight into the creation of clinically useful tools and education to support the unique needs of clinicians and patients in functional, integrative and natural health.

Izabella Wentz, PharmD, FASCP⁺

Izabella Wentz, PharmD, FASCP, is a nationally acclaimed thyroid specialist and licensed pharmacist who has dedicated her career to helping practitioners and patients understand and properly address thyroid function, particularly in the >90% of cases involving an immunological component. Dr. Wentz is the author of several best-selling books, including the New York Times best seller Hashimoto’s Thyroiditis: Lifestyle Interventions for Finding and Treating the Root Cause and is dedicated to educating the public and healthcare professionals about functional medicine approaches to optimizing thyroid function and overall health.

Samuel F. Yanuck, DC⁺

Samuel F. Yanuck, DC, is the CEO and Director of Education for Cogence^®, an online functional immunology course, serving nearly 10,000 clinician participants from more than 60 countries around the world. He is an adjunct assistant professor in the Program on Integrative Medicine, at the University of North Carolina School of Medicine. Dr. Yanuck co-directs the Yanuck Center for Life and Health, a functional medicine clinic in Chapel Hill, North Carolina, where he’s been seeing patients from everywhere since 1992. Dr. Yanuck helped co-develop the PureResponse^™ exclusive.

*Dr. Kelly Heim is an employee of Pure Encapsulations^®.
*Dr. Chris Oswald is an employee of Pure Encapsulations.
*Amy Doyle is an employee of Pure Encapsulations.
+Our Medical Consultants are retained advisors to Pure Encapsulations^®.
This information is intended for use by healthcare practitioners, is for informational purposes only, and does not establish a doctor-patient relationship.