Book a ConsultationPat & Karen Schatzline × Functional Medical Institute
Peptides for Peak Vitality
Take back control of your health with physician-directed peptide therapy, comprehensive lab work, and root-cause functional medicine from the medical team we trust with our own health.
“What Your Doctor Sees (and What They Don't)” · a free 30-minute webinar with Drs. Mark & Michele Sherwood
“Your body was built to heal. We help it remember how.”
Drs. Mark & Michele Sherwood, Functional Medical Institute
Why we put our name on this
We're Pat & Karen Schatzline, evangelists, authors, and speakers who have spent the last decade helping hundreds of thousands of people take back their health. We've seen the supplement fads, the miracle powders, and the wild-west peptide market, and we wouldn't point you toward any of it.
Vitality Kingdom Labs exists for one reason: to connect the people we love to the medical team we personally use and trust. Drs. Mark & Michele Sherwood at Functional Medical Institute do it right: comprehensive blood panels (not a single page of “normal”), third-party tested peptides with certificates of analysis, bioidentical hormones, and a plan built from your results, not a template.
This is the team we trust with our own health, and the one we recommend from every stage we stand on.
What you get at FMI
Comprehensive lab panels
Deep blood work that looks for optimal, not just “normal.”
Peptide therapy done right
Physician-directed dosing, COA-verified sourcing, real guidance.
Bioidentical hormone optimization
Nothing synthetic unless you ask for it.
Root-cause functional medicine
They're not here to manage disease. They're here to end it.
Functional Medical Institute
Meet Drs. Mark & Michele Sherwood
With over fifty years of combined experience in medicine and wellness, the Sherwoods lead a full-time wellness-based medical practice built on a whole-person approach. They are not here to manage your disease. They are here to end it.
Dr. Michele Neil-Sherwood, DO
Board-certified physician and Fellow in Osteopathic Internal Medicine; IFM and AMMG certified practitioner. A former national physique champion with black belts in taekwondo and judo, she pairs deep medical training with a passion for natural healing, and she teaches clinicians worldwide on nutrigenomics and nutrigenetics.
Dr. Mark Sherwood, ND
Doctor of Naturopathy certified in age management, peptide therapy, hormone therapy, nutrigenetics, GI health, and immunology. A 24-year veteran of the Tulsa Police Department (a decade on SWAT), former Oklahoma state bodybuilding champion, and ex-professional baseball player.
1
Eradicate self-imposed, choice-driven disease conditions.
2
Eliminate the usage of unnecessary medications.
How FMI Cares for the Whole Person
A science-based approach with unique, personal plans built from diagnostics, experience, and proven results. In person or via telehealth, no matter where you live.
Peptide Therapy
Physician-directed protocols from the doctors who wrote the book on peptides.
Hormone Balance
Bioidentical optimization guided by comprehensive lab work.
Deep Lab Panels
Blood work that looks for optimal, not just “normal.”
DNA Analysis
Nutrigenomics and nutrigenetics tailored to your unique biology.
Nutrition & Medical Food
Food-first plans, supplementation, and proprietary formulations.
Exercise Prescription
Movement plans matched to your body and goals.
Rest & Stress Management
Sleep, recovery, and resilience are part of every plan.
Immune & Gut Health
GI health and immune resiliency from the root cause up.
The 90-day framework for real repair
Longevity 90
Built from 25,000+ patient conversations: a physician-guided, three-phase program for detoxification, repair, and longevity from Drs. Mark & Michele Sherwood. Pre-Tox, Detox, and Post-Tox, mapped day by day across 90 days.
Learn from the doctors
Peptides Unlocked
The Sherwoods literally wrote the guide on peptide therapy. Peptides Unlocked: A Guide to Health, Longevity, and Performance covers everything from BPC-157 and CJC-1295 to peptides for longevity, cognition, immunity, and fat loss. It's the same expertise behind every protocol they prescribe.
They've also co-authored bestselling books including The Quest for Wellness, Fork Your Diet, Surviving the Garden of Eatin', and The Narrow Road. They host the shows Furthermore and Living the Wellness Life, and have produced films including the Fork Your Diet documentary.
The newest release
Authentic Longevity
The Sherwoods' latest book brings their whole-person approach to living longer and living well. It's the perfect starting point before your first consultation, and the same philosophy you'll experience as their patient.
Get Authentic Longevity on Amazon →Free 30-minute webinar
What Your Doctor Sees (and What They Don't)
Ever been told your labs are “normal” but you still don't feel right? Reference ranges are built on an average population that's already unwell. Join Drs. Mark & Michele Sherwood to learn what your results may be missing, and what happens in your body before disease develops.
Reserve Your Spot →Book a Consultation
Ready to go deeper? Tell us a little about yourself and the FMI concierge team will reach out personally: comprehensive health history, symptom review, detailed lab evaluation, and a clear plan for what's next.