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About Forum Health Modesto, CA

Karen Fields
APRN, PA, FNP
Karen Fields, APRN, PA, FNP
Karen’s professional journey has been driven by a deep passion for exploring alternative healthcare approaches and holistic solutions through the lens of functional medicine. Her motivation stems from witnessing the struggles many patients face—whether it’s side effects from conventional medications or a lack of focus on addressing the root cause of illness. Through her exploration, Karen discovered the transformative potential of functional medicine in promoting long-term health and overall well-being.
This realization ignited her commitment to helping patients overcome hormonal imbalances—whether due to aging, perimenopause, menopause, PCOS, low testosterone, or decreased libido—by using bioidentical hormone replacement therapy alongside personalized nutritional and supplemental support.
Karen recognized a major gap in conventional healthcare when it comes to hormonal health and the importance of gut health in optimizing wellness. She has dedicated herself to bridging that gap and guiding patients toward sustainable, meaningful results.
We’re thrilled to have Karen ay Forum Health Modesto to offer you the opportunity to benefit from her expertise, compassion, and patient-centered approach to care.
SPECIALTIES
EDUCATION
Graduated from UC Davis School of Medicine (FNP/PA Program)
Graduate of Fullerton State College Business Administration
Graduate of UC Regents in Health Sciences
Graduate from Institute of Aromatherapy
AFFILIATIONS & ACCREDITATIONS
- Certification as Family Practice Nurse Practitioner (AANP)
- Certification as Physician Assistant (NCCPA)
- APRN (Advance Practice Registered Nurse)
- A4M – (American Academy of Anti-aging Medicine)
- Certification in Aromatherapy

Sarah Lilly
PA-C, NP, MSN, BSN, RN
Sarah Lilly, PA-C, NP, MSN, BSN, RN
Sarah Lilly, PA-C, brings enthusiasm, expertise, and over a decade of experience to her role as a Physician Assistant at Forum Health Modesto. She has built a distinguished career helping men and women achieve optimal wellness through advanced hormone management. Known for her meticulous attention to detail and compassionate care, Sarah focuses on understanding each patient’s unique needs to provide personalized, effective solutions.
After earning her Physician Assistant and Nurse Practitioner certifications from UC Davis in 2009, Sarah gained extensive experience in hormone optimization, skincare, and primary care. Sarah found early in her career that she had a desire to help people prevent chronic diseases and to help them find solutions that were more holistic and integrative. She found a passion in helping people find the root cause through a functional medicine approach. With certifications in Biote, and Worldlink Medical, she is committed to maintaining the highest standards of safety and care.
Her work not only supports patients in feeling their best but also helps boost their confidence and overall well-being. Sarah is passionate about building strong relationships with her patients. Her warm, communicative approach reflects Forum Health’s mission to empower individuals to take charge of their health and thrive.
SPECIALTIES
EDUCATION
- Master of Science in Nursing (MSN) | California State University, Sacramento – 2010
- Bachelor of Science in Nursing (BSN) | California State University, Stanislaus – 2004
- Associate Degree in Nursing (ADN) | Modesto Junior College – 2002
ACCREDITATIONS & CERTIFICATIONS
- Physician Assistant Certification | UC Davis – 2009
- Nurse Practitioner Certification | UC Davis – 2009
- California Board of Registered Nursing – RN
- National Certification of Physician Assistant (PA)
- Certified in BioTe, Worldlink Medical BHRT
- Certified in The Menopause Society
ADVANCED TRAINING
Forum Health Modesto
Forum Health Modesto, a functional medicine provider, is proud to serve the state of California with alternative medicine practitioners, thyroid doctors, HRT hormone replacement therapy, health coaches, medical weight loss services, and a result-driven team. Karen Fields, NP leads a functional medicine care team that includes nurse practitioners, health coaches, and more. Specializing in digestive and immune health, weight loss, pain management, hormone imbalance, detoxification, emotional wellness and mental health, the endocrine and lymphatic systems, cardiovascular health, and the musculoskeletal system, the Modesto team can help you achieve optimal health and wellness. They can also connect you to Forum’s nationwide network of expert providers.
Our Approach
Forum Health Modesto offers holistic, personalized medicine that targets the underlying causes of a disease and health challenges. Rather than treating the symptoms, our providers treat the whole person – body, mind, and spirit – with customized care plans that are tailored to individual needs. With a broad range of advanced diagnostics and innovative therapies, Forum Health providers reveal otherwise hidden issues that patients may not realize impact their everyday life.
OUR MISSION:
- To provide healthcare guided by professional standards developed through expertise, training, and experience of peers and professional organizations.
- To offer safe, high quality, professional services in a caring and supportive atmosphere.
- To facilitate a healing response with the least invasive and safest approaches possible.
- To strive to identify any causes or triggering factors that underlie symptoms.
- To know each patient not only medically, but also as a unique person.
- To commit to ongoing education of the medical and supportive staff of the Center, striving for the highest standard of healthcare guided by cutting-edge knowledge.
- To encourage patients to be informed and involved in their own healthcare decisions, knowing that informed and pro-active recipients of healthcare have better treatment outcomes.
- To foster happiness of all who work here, knowing that laughter and fun result in fulfillment both in our lives and in the lives of those who trust their care to us.
Your Wellness Journey Begins Here
Contact us today to speak with one of our Forum Health Advisors to discuss treatments, providers, costs and if Forum Health is right for you!
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