Meet The Team

Flatiron Functional Medicine Staff
Dr. Jill Carnahan
Dr. Jill Carnahan

Functional Medicine Expert

Dr. Jill is Your Functional Medicine Expert! She uses functional medicine help you find answers to the cause of your illness and the nutritional and biochemical imbalances that may be making you feel ill. Functional medicine is personalized medicine that deals with root cause of disease instead of just treating symptoms. Dr Jill will search for underlying triggers … > more

Crystal Crowley
Crystal Crowley, MS, PA-C, IFMCP

Physician Assistant

Crystal has been a board-certified physician assistant (PA) since 2004 and has treated many thousands of patients in private practice, hospital medicine, emergency medicine and functional medicine clinical settings. She completed her undergraduate degree in Kinesiology/Integrative Physiology at the University of Colorado at Boulder and received her Master of Science … > more

Ali Fostvedt

Office Manager

Ali grew up in the rural mountains of Boulder and from a very young age, Ali was taught to live a healthy and balanced lifestyle, spending much of her time outdoors. For many years Ali worked at an holistic dental practice where she learned to look at the person as a whole and she became passionate about building relationships with patients and assisting them with whatever needs they had. Ali joined Flatiron Functional Medicine in 2020 and is excited to continue her education in functional medicine and to work in an environment filled with compassion, knowledge, and integrity. When she is not at work, Ali is playing with her two young children and exploring the outdoors with her husband and two dogs.

Natalie Hartel

Store Manager

Natalie has been with Flatiron Functional Medicine since early 2019. She is a recent graduate of the University of Findlay in Ohio where she earned a Bachelor of Science Degree in Wellness and Exercise Promotion and played DII lacrosse. She is passionate about total body wellness and believes it is important to work on all domains of health, not just physical. She is our supplement and Dr. Jill Health store expert! When she is not at work, Natalie enjoys playing and watching sports, cooking, and spending time with her friends and family.


Administrative Assistant

Jessica is a registered psychotherapist and graduated from Colorado School for Family Therapy. She was pursuing a career as an Addiction Counselor when she decided to switch her focus on to a functional medical administrative position. She is passionate about helping others and is a hard worker. She is a single mom and spends her free time with her toddler daughter Isabelle.


Administrative Assistant

Loretta started with Flatiron Functional Medicine after graduating with her Bachelor’s degree in Biblical studies and communication. She enjoys working here because of the family-like atmosphere and the chance to use her skills to serve and love people. Loretta spends her spare time running her Instagram blog, petting dogs, reading, and volunteering with her church’s youth group.

Wanna be part of our team? Get in touch!
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    Dr. Jill

    Dr. Jill is Your Functional Medicine Expert! She uses functional medicine to help you find answers to the cause of your illness and addresses the biochemical imbalances that may be making you feel ill.

    She’ll help you search for underlying triggers contributing to your illness through cutting edge lab testing and tailor the intervention to your specific needs as an individual.

    She may use diet, supplements, lifestyle changes or medication to treat your illness but will seek the most gentle way to help your body restore balance along with the least invasive treatment possible. Dr. Jill is a functional medicine expert consultant and treats environmental and mold-related illness as well

    Hope (belief in a positive outcome)
    • Creating an environment of hope that fosters a healing environment
    • Genuine love for all patients as the foundation of healing
    Health (state of optimal physical, mental, social, emotional well-being)
    • Pursuing optimal wellness regardless of presence or absence of disease
    • Partnering with patient to create a dynamic state of energy and vitality
    • Empowering patients to take an active role in their health
    Healing (restoring function and repairing damage to the human body)
    • Seeking the root cause of your illness (rather than simply treating your symptoms) and restoring balance
    • Building a relationship of trust as we partner to seek solutions
    • Reversing the course of complex chronic disease by changing lifestyle
    • Believing in the innate healing ability of the body if given the right foundational nutrients