Our Practitioners

Jan Kielmann is the Director of Nutrition at Functional Wellness. He is a widely respected teacher and leader in the Integrative Medicine field, currently pursuing a Doctorate in Clinical Nutrition (DCN) at Maryland University of Integrative Health. 

Jan (pronounced Yahn) holds a Masters of Science Degree in Human Nutrition (with honors) from the University of Bridgeport in Connecticut, one of the most advanced scientific and evidence-based nutrition programs in the country. In addition to that, he is board-certified in Clinical Nutrition (CNS®) by the American Nutrition Association, and an Institute for Functional Medicine Certified Practitioner (IFMCP), both one the most prestigious institutions for personalized Nutrition in the country.

Jan regards both nutrition and emotional health as the core of healthcare and focuses on nutritional and botanical interventions to support chronic, degenerative and auto-immune diseases, patients with cancer, energy and brain health challenges, food intolerances, mold exposure, Lyme disease, chronic infections, as well as general disease risk prevention and optimal wellness.

He has almost a decade of experience, studying and training with the best Nutritional, Naturopathic, Functional and Integrative practitioners in the country: Dr. Jeffrey Bland, PhD, CNS®, Dr. Datis Kharrazian, DC, PhD, Dr. David Perlmutter, MD, Dr. Aristo Vojdany, PhD, Dr. Walter Crinnion, ND, Dr, Lyn Patrick, ND, Dr. Ben Lynch, ND, Dr. Paul Anderson, NMD, Dr. Robert Roundtree, MD, Dr. Joseph Pizzorno, ND, Dr. David Haase, MD, David Winston, RH (AHG), Feather Jones, RH (AHG) and many many other brilliant minds in integrative (true) healthcare, prevention and wellness.

Besides his nutritional training, Jan is continuously focusing on the newest research in Botanical medicine (Traditional, Eclectic & Functional Herbalism), Environmental Medicine (Toxins and their effect on the body), Functional Medicine (Underlying root causes of dysfunction), Nutritional Genomics (The interaction of our Genes with the Environment), Functional Immunology (advanced immune system function and dysfunction), the microbiome (our largest organ!) and Integrative Mental Health.

He co-founded the professional Functional Nutrition Forum with currently more than 4500 licensed healthcare practitioners, as well as the public Functional Nutrition Forum, the Fasting, Stem Cells and Longevity and other groups on Facebook and is active on the legislative and public relations level to help bring Personalized Nutrition into its place as the center of Healthcare. He teaches Nutritional Genomics to Residents, Medical Doctors and other Healthcare practitioners nationally and internationally, besides advising, consulting and representing innovative companies and organizations in the integrative medical, nutritional, nutraceutical and diagnostic fields.

Memberships in professional organizations include the American Nutrition Association (ANA), The Institute for Functional Medicine (IFM), The American Association of Naturopathic Physicians (AANP), The American Academy of Environmental Medicine (AAEM), The National Association of Environmental Medicine (NAEM), The American Botanical Council (ABC), The International College of Generative Medicine (ICGM), The Seeking Health Educational Institute (SHEI) and the Nutritional Genomics Institute (NGI).


Dr. Cynthia Barrett, PT, DPT, CSCS, CNS®, IFMTP, known as The Gut Health Guru® is Founder and CEO of Wellness Couture®, LLC providing targeted testing and evaluation as the foundation for the next level of health, nutrition and fitness based on each client’s unique microbiota and chemical makeup.

Dr. Barrett has a deep passion for health and wellness, having founded Wellness Couture after realizing conventional medicine can fail to improve chronic health ailments because it often ignores the unique aspects of an individual’s chemical makeup. Wellness Couture’s results indicate many individuals’ chronic health issues are rooted in their bodies’ sensitivities and nutrient deficiencies. Dr. Barrett initially found this to be true in her own life healing herself from a number of chronic health ailments.

Since then, Dr. Barrett has seen dramatic improvements in clients of all ages by first evaluating each individual’s unique physiology with the most advanced medical testing, and then developing a tailored program of health and nutrition that leverages those unique characteristics into results.

Her success tailoring custom-made wellness programs for clients led her to partner with Cenegenics NYC on Wall Street, where she leads the Advanced Food and Nutrient Testing Program.

A lifelong runner having competed collegiately in track & field, Dr. Barrett is also a Certified Strength and Conditioning Specialist (CSCS) and holds a pre/post Natal certification. Dr. Barrett formally was a Trainer and Group Fitness Instructor, teaching the popular Equinox “Signature” program, Precision Running, at Equinox Wall Street, Flatiron and Gramercy locations, and appeared in Equinox’s Furthermore Magazine and several television news segments about the program. Dr. Barrett was also formally a running coach at Rise by WeWork, where she coached the Rise + Run team.

Dr. Barrett is a Certified Nutrition Specialist (CNS®) and an Institute for Functional Medicine Trained Practitioner practicing Functional Medicine or “root cause medicine,” focusing on the Gut Microbiome. Dr. Barrett has been featured in Business Insider, Women’s Day Magazines and The Zoe Report, providing expert nutrition insight. She holds a bachelor’s degree in Community Health Education from Hunter College and obtained her Doctorate in Physical Therapy (DPT) from New York University.

Dr. Barrett was selected to run the 2018 TCS NYC Marathon on team New Balance and is a member of New York Road Runners (NYRR), where she provides nutrition workshops on Marathon Training.

On her spare time, you will find Dr. Barrett out for a run, hitting the gym or the hottest fitness class, traveling, and attending biohacking or medical conferences to gain knowledge and expertise on the most up to date cutting edge treatments for her patients.