Dr. John Gannage, MD

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Markham, ON
Dr. John Gannage, MD

Dr. John Gannage is a Leader in Integrative Medicine to Restore Health and Prevent Disease

MARKHAM INTEGRATIVE MEDICINE is a clinic specializing in Integrative Medicine (integrating conventional and complementary/functional medicine) located in the City of Markham’s heritage district. DR. JOHN GANNAGE, MD is a leading provider of Integrative Medicine, offering health services as a licensed medical doctor to the Greater Toronto Area since 1992.

11/28/2025

Feeling drained, foggy, or just not yourself lately? The Myers Cocktail is one of the most effective ways we support energy, immunity, and overall recovery from the inside out.

This blend of vitamins, minerals, and antioxidants works quickly to replenish nutrients your body may be low in, especially if you’re dealing with chronic stress, gut issues, burnout, or frequent illnesses.
In our clinic, we personalize each infusion based on what your body actually needs so you feel the difference not just today, but long term.

If you’re curious whether a Myers Cocktail could help you feel clearer, calmer, and more supported, you’re in the right place.

Comment MYERS to learn how this infusion supports energy, immunity, and recovery.

11/26/2025

PCOS isn’t just a hormone issue, it’s metabolic, inflammatory, and deeply connected to blood sugar. When insulin resistance takes the lead, your stress hormones spike, inflammation rises, and your ovaries get mixed signals. That’s why cycles shift, skin flares, and energy crashes.

Most treatments only quiet symptoms. Functional medicine looks deeper: insulin, cortisol, DHEA, progesterone, and even the gut. Once we know what’s off, we support your body so it can actually rebalance.

With the right nutrition, key nutrients like inositol and magnesium, and real stress plus sleep support, your hormones can stabilize and real improvements follow.

If you’re ready to understand what’s actually driving your PCOS, comment PCOS and we’ll help you get to the root.

11/25/2025

If you’ve felt unheard, dismissed, or stuck with symptoms no one can explain, meet the clinicians behind Markham Integrative Medicine.

Each of our doctors bring a unique blend of experience, specialties, and philosophy, but the mission is the same: root-cause care, evidence-informed medicine, and truly personalized support.

From MCAS and histamine intolerance, to hormonal balance, metabolic health, environmental medicine, chronic illness, and whole-body healing, the team you’ll meet in this carousel is dedicated to helping you understand your symptoms and reconnect with your health.

Swipe through to get to know Dr. Gannage, Dr. Arvind, and Dr. Yu.

If you’re seeking care that goes deeper, we’d be honored to support you.

11/24/2025

Bloating isn’t always a sign that something is “wrong.” In many cases, it’s simply your microbiome doing its job. When healthy bacteria ferment fiber and prebiotics, they create vitamins, short-chain fatty acids, and compounds that protect your gut lining and support your immune system.

The issue isn’t mild bloating, it’s when the gas, distension, constipation, or pain become persistent. That’s when we start thinking about deeper imbalances like dysbiosis or bacterial overgrowth, and why comprehensive stool analysis can offer real answers.

Nourish your microbiome, skip the ultra-processed foods, and give your gut the inputs it needs to work for you, not against you.

Comment GUT if you want to learn how to calm bloating and support a healthier microbiome.

11/21/2025

Autism care cannot be reduced to a single protocol or trend. At Markham Integrative Medicine, we focus on understanding each child’s unique biology first, then layering interventions thoughtfully from sleep and gut health to metabolic and behavioral supports, and targeted medical care when appropriate.

The result is not just symptom management, it’s measurable, sustainable progress designed to help each child thrive physically, emotionally, and cognitively.

Comment CLARITY to learn how a personalized, evidence-informed approach could make a difference for your child.

11/19/2025

You’ve cut the foods and taken the supplements. You’ve followed every low-histamine list, but your symptoms still run the show.

That’s because food isn’t the enemy, inflammation is.
When your body’s overloaded by stress, toxins, or underlying imbalances then it starts reacting to everything. The solution isn’t more restriction, it’s restoring balance.

If food fear has taken over, it’s time to get to the root of what’s driving your symptoms.

Comment BALANCE to book a consultation and learn how functional medicine can help calm your system from the inside out.

11/18/2025

Symptoms like fatigue, headaches, hives, or digestive issues may look similar, but the biology is very different.

MCAS is overactive mast cells releasing histamine and hundreds of inflammatory mediators. Histamine intolerance happens when your body can’t properly break down histamine. MCAS can cause histamine intolerance, but histamine intolerance does not cause MCAS.

Treating them interchangeably delays results. A functional, integrative approach identifies the root cause, addresses triggers, and creates a plan that actually works specifically for you and you symptoms.

If MCAS or histamine-related symptoms have left you frustrated, it’s time for clarity and precision in care.

Comment SYMPTOMS to book a consultation and uncover what’s driving your symptoms.

11/17/2025

Glutathione is your body’s master antioxidant, essential for detoxification, cellular repair, and defending against oxidative stress. But when your toxic load is high, especially from heavy metals like mercury, lead, and cadmium, your glutathione stores get used up fast.

Once glutathione binds to these toxins, it can’t be recycled. That means less protection for your cells and more inflammation over time.

Supporting your body’s natural production with nutrients like vitamin C, selenium, and zinc and reducing exposure wherever possible. This helps keep your glutathione reserves strong.
If you’re feeling sluggish, inflamed, or slow to recover, it might be time to check your glutathione levels and toxic burden.

Comment GLUTATHIONE to learn how to support your body’s natural detoxification pathways.

11/14/2025

If you’ve tried eliminating high histamine foods and still feel reactive then there’s a reason.

Histamine intolerance isn’t only rooted in what you’re eating. Stress, overwhelm, and nervous system dysregulation can activate mast cells the same way certain foods can…and this is the hidden trigger most people never address.

When your system is stuck in constant “threat detection mode,” histamine release becomes easier to spark even when your diet is “clean.”

If you feel like you react to everything, or flare for reasons that make zero sense, it might not be about adding more food rules. It might be about calming the internal signal telling your cells they’re not safe.

Comment HISTAMINE for support that looks beyond lists…and into the root cause.

11/12/2025

B vitamins aren’t just “energy vitamins.” They’re critical for mitochondrial function, neurologic health, blood cell production, and brain performance.

And while we rarely see the classic old textbook deficiencies anymore… what we are now seeing far more often are functional and compartmental deficiencies. Meaning: your blood test can look “normal”, but your cells, tissues, mitochondria, and brain may not be actually getting what they need.

When you combine this with processed food, milling, soil depletion, fertilizers/pesticides, and dysbiosis impacting the microbiome (which is a major producer of B vitamins itself)… it becomes clear why so many patients are suboptimal today.

This is one of the key reasons I emphasize nutrient density, organic produce where possible, and restoring the gut ecosystem because B vitamins literally fuel energy transfer at the cellular level.

Comment B VITAMINS and I’ll send you details on how to book a consultation.

11/11/2025

Most people think mast cell activation is random… but it’s not.

There are patterns. There are drivers. And there are root causes that go deeper than genetics.

New research shows that environment, stress exposure, toxins, trauma, and nutrient status can actually change how mast cells express genes, which explains why symptoms escalate or multiply over time.

The good news: epigenetic changes are reversible. Which means there are science-based strategies to calm, retrain, and stabilize mast cell function.

Inside the new blog, I break down what this means for diagnostics, treatment planning, and long-term healing.

Comment MAST CELLS to read the full blog and learn how to begin rewiring mast cell behavior at the root.

11/10/2025

Sleep isn’t passive. It’s active, regenerative, restorative medicine.

During deep sleep the nervous system resets, cortisol lowers, insulin sensitivity improves, the immune system calibrates, and your brain literally clears metabolic waste.

So if you’ve been trying to “push through” exhaustion, your body isn’t asking you to push harder. It’s asking you to repair it.

Instead of reaching for another supplement bandaid… we look at the WHY: stress dysregulation, hormones, blood sugar swings, screen exposure, gut imbalance, inflammatory load.

Because when sleep improves everything improves, so tonight, give your body permission to restore, not fight.

Comment SLEEP so we can start rebuilding from the foundation.

Address

300 Main Street Markham N
Markham, ON
L3P1Y8

Website

http://www.integrative-medicine.ca/

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