Natural Functional Healthcare in Lancaster, PA
You deserve answers.
Not just prescriptions.
If you’ve been told your labs are normal, but you still don’t feel like yourself, you’re not alone. We help uncover what’s holding your health back so you can finally understand what’s going on and what to do next.
No drugs. No surgery. Just real answers and natural care, right here in Lancaster.
Serving Lancaster, PA since 1997
4.9 Google Rating | 130+ 5-Star Reviews
Sound familiar?
If any of this sounds like you, you’re in the right place!
“My doctor says everything looks fine — but I feel terrible. I know something is wrong.”
“I don’t want to be on medication for the rest of my life. There has to be another way.”
“I’ve changed my diet, and I feel better than I did — but I know I haven’t gotten to the root of it yet.”
That’s exactly who we help.
We’ll help you uncover what’s really going on and create a clear path forward.
We help people find answers for conditions like these
Fatigue & Low Energy
Always tired, no matter how much you sleep. Exhausted, flat, and running on empty.
Hormone Imbalance
Mood swings, weight changes, menopause symptoms, or fertility challenges that haven’t been resolved.
Thyroid Health
Sluggish metabolism, cold sensitivity, hair loss, weight gain, or thyroid concerns your doctor says are “normal”.
Digestive Issues
Bloating, reflux, IBS, constipation, or a gut that’s unpredictable no matter what you eat.
Blood Sugar & Insulin Resistance
Energy crashes after meals, constant cravings, or pre-diabetes diagnosis.
Brain, Mood & Mental Health
Brain fog, memory issues, anxiety, depression, OCD, and more.
Immune System & Chronic Illness
Lyme disease, autoimmune conidtions, frequent illness, or a body that struggles to recover and stay well.
Chronic Pain & Inflammation
Joint pain, widespread inflammation, or persistent pain without a clear diagnosis or lasting relief.
Men’s Health
Natural support for prostate, hormone balance, low energy, brain fog, and vitality for men.
A more complete approach to finding answers
Most healthcare approaches focus on only part of the picture. We combine functional lab testing, Nutrition Response Testing®, personalized nutrition, and ongoing guidance to help you understand what’s happening in your body and create a clear path forward.
Conventional Care
- Labs reviewed against broad normal ranges
- Symptoms managed with medication
- Limited appointment time
- Treatment focused
- Symptoms may improve temporarily
Typical Functional Medicine
- Advanced lab testing
- Root causes investigated
- Natural protocols recommended
- Follow-up usually every 1-2 months
- Guidance varies by practice
Our Approach
- Comprehensive labs reviewed through a functional lens
- Nutrition Response Testing® to identify your body’s priorities
- Personalized food and whole-food supplement plan
- Structured four-month program with regular check-ins
- Follow-up testing and long-term maintenacne support
The goal isn’t just normal lab numbers. It’s helping you genuinely feel better, understand your health, and create lasting improvements.
You may be in the right place if you’re looking for:
- Answers beyond symptom management and a better understanding of what’s really causing your health concerns
- Guidance to learn what your body needs and make meaningful changes with confidence
- A process that focuses on lasting results, not quick fixes
- A practitioner who takes the time to explain your results and what they mean for you
- Real health improvement, not just temporary symptom relief
- A team that tracks your progress, adjusts your plan, and supports you along the way
Could this be the right next step for you?
If you’re ready to look beyond symptoms and explore the role of nutrition, lifestyle, functional lab testing, and underlying imbalances, there’s a good chance our approach can help.
We believe meaningful health improvements come from understanding what’s happening in your body and creating a personalized plan that addresses the factors contributing to your symptoms. That process takes time, guidance, and support. Fortunately, you don’t have to figure it out alone.
Schedule a free 15-minute call to ask questions and talk through your situation. There’s no pressure — just an honest conversation.
We start with the foundations of health
Nutrition.
Digestion.
Blood sugar balance.
Immune function.
Sleep.
Stress.
Movement.
These everyday factors have a profound impact on how you feel. That’s why we focus on building a strong foundation before chasing more complicated solutions.
What our patients say
Real stories from people who were looking for answers, support, and a clear path forward.
“I’ve been going to Sheehan Natural Health for 6 months now. I had tried to get help from several medical doctors who said they couldn’t find anything and were very dismissive. I was getting worse and desperate for help.
At Sheehan Natural Health I was heard and helped. Dr. Sheehan, his wife Laura, Jennifer, Liz, and Becky all give me the attention and help that I need. They are all very knowledgeable and good at what they do.
I’m getting better now and I’m so grateful for the natural approach to good health and this group of good loving caring people who have helped me from the very first day.“
“Before coming to see Laura I was pretty miserable. I woke up every day feeling terrible; lack of energy, physical discomfort, pain everywhere. I felt like I was starting off every day already behind. I had losts of brain fog, lack of mental clarity, and no energy. Now I feel healthier. I have a lot more energy, my mental clarity is finally back and not limiting me anymore, like it was before. I’m able to enjoy life more!”
“I was a mess…couldn’t get my dr to see me and was getting the run-around…told me surgery is my only option…not doing it. I went to Dr Sheehan and I never looked back. I had gallstones, terrible skin, and stomach issues.
Dr Sheehan looked at me and said he could help and he did. I feel fabulous. The girls in the office are awesome. So helpful and kind. I can’t say enough about Sheehan Natural Health and the people there. I recommend them to anyone with a problem.”
“Dr. Sheehan has a true passion for helping patients heal naturally through diet, exercise, and nutrition response testing. He is thorough and always takes time to answer questions.
After struggling with eczema, chest pain, digestive issues, and back pain without real answers, he helped me get to the root cause. I no longer have back pain and even lost 48 lbs in just over 4 months. The staff is always friendly and welcoming.
My only regret is not coming sooner. I highly recommend Sheehan Natural Health and Improvement Center to anyone who wants to improve their health naturally.”
These are just a few of the people we’ve had the privilege of helping. Read more success stories.
Getting started is straightforward
Here’s what happens when you reach out. No surprises, no pressure.
Watch videos + Quiz
Dr. Sheehan walks you through how Nutrition Response Testing works, so your first appointment is spent entirely focused on you.
About 30 min. Do it at your own pace.
We’ll reach out to you
Once we receive your quiz, we’ll personally connect, hear your situation, answer questions, and walk you through what to expect.
We call you — no chasing required.
Start your personalized program
When you’re ready, we schedule your evaluation and begin with comprehensive lab testing, Nutrition Response Testing, and a personalized plan.
Built around your body, your labs, and your goals.
A husband-and-wife team with one shared mission
Dr. Keith Sheehan
Dr. Sheehan’s path to natural health was personal. After a series of severe illnesses, he discovered that chiropractic adjustments weren’t holding. When he added nutritional therapy, everything changed. That experience became the foundation of his 28-year practice, led to the creation of Nutritional Blood Chemistry™, now taught to practitioners across the country, and continues to guide his commitment to doing what’s best for every patient.
Laura Sheehan
Laura also struggled with chronic health issues that were fully resolved with nutritional therapy, and this changed the direction of her life. She now co-runs the practice, leads research, and specializes in women’s health, fertility, pregnancy, children’s health, and functional mental health.
Together, Keith and Laura are continually researching, learning, and refining what works. This is not a practice built on theory or trends. It is built on personal and clinical experience.
Not ready to book yet? Start here.
These free resources are a great way to get to know our approach and start feeling better before you even walk through our door.
Free mini-course: Eat With Purpose
The exact eating approach recommended to many patients. Available as a free, self-paced course.
The Sheehan Newsletter
Short, practical health tips patients look forward to every week. No fluff, just useful guidance.
Natural health articles
Dig deeper into the conditions treated, the tests run, and the natural approaches that actually work.
Frequently Asked Questions
Do you accept insurance?
We are a self-pay practice. Most insurance plans do not cover nutrition services or the functional lab testing we use, which is one reason we can do things differently than a conventional insurance-based practice. We do accept HSA cards and can provide itemized receipts for possible reimbursement. We cannot provide Medicare or Medicaid-compatible receipts for these services.
Can my medical doctor order the lab work instead?
Our panel is custom-designed to target functional ranges and nutritional markers that most conventional doctors rarely order, mostly due to insurance limitations. Even when patients bring recent labs, we still run our own panel because it is the roadmap for building the personalized plan.
How is this different from seeing a regular functional medicine doctor?
The difference is the structure. Sheehan Natural Health combines functional labs with Nutrition Response Testing and a structured four-month program that includes regular check-ins, progress reports, follow-up labs, and ongoing maintenance support.
How long does the program take?
It starts with a thorough evaluation and a personalized four-month program, followed by re-evaluation and an ongoing care plan. Many patients continue with maintenance care, which usually starts with monthly visits, because health is something you keep supporting over time.
Do you see children?
Yes, but not as standalone patients. At least one parent needs to be actively enrolled because the home environment plays a major role in helping children get results. We do offer family plans, with discounted visits for children when parents are enrolled.
Where are you located, and do you offer virtual appointments?
The office is located at 1301 East King Street, Lancaster, PA. While in-person visits are the best way to receive care, we also offer virtual appointments for certain services, particularly our Functional Medicine program. If you are outside of Lancaster County and wish to work with us remotely, please mention this when you contact us, and we will inform you about the options available for your situation.
Real answers. A real plan. And a team that stays with you long after the first visit.
We start with a thorough evaluation and create a personalized program that addresses the root causes of your issues. Feeling better is just the beginning. As your body changes, we support you with regular check-ins, follow-up lab tests, and ongoing guidance.
“We’re not trying to manage your symptoms. We’re trying to make you healthier. Those aren’t the same thing — and we’re in it with you for the long haul.”