Jacksonville Beach, Florida • Opening Late 2026
Functional medicine, hormone optimization, and longevity care rooted in faith, science, and a deep commitment to your whole health. • Opening Late 2026
Where faith, science, and radiance meet.
Katie Keller, PA-C
Photo coming soonMeet Your Provider
Katie Keller, PA-C brings a rare combination to functional medicine: eight years of clinical experience in hematology and oncology survivorship at Mayo Clinic Florida, grounded in a deep personal calling to help women thrive — not just survive.
At Light & Longevity, Katie partners with patients to uncover the root causes of hormonal imbalance, chronic fatigue, and post-cancer health challenges — and builds a personalized roadmap to lasting vitality.
Our Philosophy
We believe healthcare should ask why — not just what. Every symptom has a story. Our role is to listen deeply, look comprehensively, and partner with you to build health that lasts for decades, not just days.
We investigate the why behind your symptoms, not just mask them. True healing begins with understanding.
We think in decades. Our protocols are designed for sustainable vitality — energy, clarity, and confidence at every stage.
This practice is rooted in purpose and stewardship — serving others with excellence and compassion.
Unhurried, personalized, trust-based care. You are known here — not just a chart number.
What We Offer
We launch with core functional medicine and expand into hormone optimization, weight management, and aesthetics as we grow — ensuring every service is delivered with clinical excellence.
Phase 1 — Available at Launch
Root-cause evaluations, advanced laboratory diagnostics, and personalized protocols for chronic symptoms, fatigue, and whole-body health.
Phase 2 — Year One Expansion
Bioidentical hormone optimization, GLP-1 weight management, peptide therapy, and IV nutrient infusions — under evidence-based protocols.
Phase 3 — Medical Aesthetics
Medical-grade aesthetic treatments that complement your wellness journey — enhancing your outer radiance as we optimize your inner health.
A Rare Specialty
Cancer survivors face challenges that most functional medicine practices are not equipped to address: hormonal disruption, metabolic changes, cognitive fog, fatigue, and a medical system that often discharges them without a roadmap. Light & Longevity fills that gap — a science-driven, deeply compassionate program for thriving after treatment, not just surviving it.
Years specializing in hematology & oncology survivorship at Mayo Clinic Florida
Dedicated functional medicine practice in Jacksonville Beach focused on survivorship
Commitment to your health for the long horizon — not just the next appointment
Signature Programs
A 3-month deep dive into your hormonal ecosystem — understanding root causes, not just replacing hormones. For women navigating perimenopause, PCOS, fatigue, weight resistance, and mood changes.
A structured 3–6 month wellness program for post-treatment cancer survivors. Survivorship labs, coordinated care plans, nutrition and supplement protocols, and oncology team collaboration.
For high-achieving professionals experiencing burnout, cognitive decline, or energy issues. Comprehensive metabolic, hormone, and performance labs with a peak-optimization protocol.
Membership
Cash-pay, no insurance. Transparent pricing. Unhurried access to your provider. Choose the membership tier that fits your season of life.
Foundation
per month
Core
per month
Concierge
per month
Opening October 2026
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Find Us
Jacksonville Beach, FL
Brick-and-mortar location — coming soon
Monday – Friday: 8:00 AM – 5:00 PM
Telehealth appointments available
hello@lightandlongevity.com
Telehealth available across Florida
Cassaundra Thompson, DO
Jacksonville Beach, FL
Map available upon address confirmation