Dr. John Gannage, MD

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.

05/26/2026

When people think about detoxification, they often focus only on the liver.

But detoxification also depends heavily on what happens inside the gut and whether waste is actually leaving the body efficiently.

In some patients, functional stool testing may show elevated beta-glucuronidase, an enzyme associated with certain bacterial imbalances that can interfere with the body’s ability to properly eliminate compounds through the stool.

When bowel movements are sluggish or constipation is present, there may be more opportunity for these compounds to be reabsorbed rather than removed.

This is one reason why gut health, microbiome balance, and bowel regularity can play such an important role in overall health and detoxification capacity.

Comment GUT if you want to learn more about how the microbiome may be influencing detoxification and inflammation.

If your seasonal allergies seem worse every year, pollen may not be the only reason.For many people, the real picture is...
05/26/2026

If your seasonal allergies seem worse every year, pollen may not be the only reason.

For many people, the real picture is much more complex. Indoor mold, air pollution, chronic inflammation, gut dysfunction, histamine overload, and ongoing immune stress can all increase how reactive the body becomes during allergy season.

That’s why some people continue struggling despite antihistamines, allergy medication, or trying to avoid outdoor triggers.

Functional medicine looks beyond symptom suppression alone and asks why the immune system has become so reactive in the first place. Factors like gut health, environmental exposures, stress, sleep quality, and chronic inflammation can all influence how intensely the body responds to allergens.

The goal is not just short-term relief. The goal is improving immune resilience and reducing the overall inflammatory burden contributing to symptoms.

Comment ALLERGIES if you want to learn more about the hidden factors that may be making seasonal allergies worse.

05/22/2026

Histamine issues are often approached like a food problem alone, but in clinical practice it is usually much more layered than that.

Sleep, stress, gut health, blood sugar regulation, environmental exposures, and nervous system balance can all influence how reactive the body becomes.

This is why many people continue struggling even when they are “eating healthy.”
The goal is not perfection. It is reducing overall load, improving resilience, and helping the body regulate more effectively over time.

Comment HISTAMINE if you want to learn more about the factors that may be contributing to histamine intolerance.

05/20/2026

Many patients with conditions like POTS, mast cell activation, IBS, autism, and chronic GI dysfunction have already seen multiple specialists before they arrive in my office.

They’ve had testing and tried therapies and yet something still feels incomplete.

That’s where integrative medicine comes in.

The goal is not to replace conventional medicine. It is to build on it by looking more closely at the gaps, the overlaps between systems, and the factors that may still be contributing to symptoms despite standard care.

Sometimes the missing piece is not a new diagnosis. It is a more complete understanding of what’s driving the condition in the first place.

Comment SUPPORT if you’ve felt stuck looking for answers beyond symptom management.

Seasonal allergies are no longer just a spring inconvenience.Pollen seasons are lasting longer. Exposure is increasing. ...
05/19/2026

Seasonal allergies are no longer just a spring inconvenience.

Pollen seasons are lasting longer. Exposure is increasing. Immune systems are becoming more reactive. And for many people, symptoms seem to get worse every single year.

The bigger question is why.

While conventional care often focuses on symptom suppression, functional medicine looks at the deeper drivers behind allergic inflammation, including gut health, environmental exposures, immune dysregulation, histamine burden, stress, sleep, and chronic inflammation.

In our latest blog post, we break down what may actually be contributing to worsening allergies and why supporting immune resilience matters just as much as symptom management.

Comment ALLERGIES BLOG if you want to learn more about what may be driving worsening seasonal allergies.

05/18/2026

Pregnancy requires a careful balance between hormones, immune function, and inflammation.

Research continues to show that endocrine-disrupting chemicals may interfere with these systems. These chemicals are commonly found in plastics, pesticides, personal care products, and many everyday household items.

This is why reducing toxic load before and during pregnancy can be so important. Choosing cleaner products, prioritizing organic foods when possible, and supporting overall nutritional health may help create a healthier environment for both mother and baby.

Comment BALANCE to learn more about reducing endocrine disruptor exposure in everyday life.

05/15/2026

When energy dips or recovery feels slower than it should, it is often a signal, not just a symptom.

In practice, there are times when oral strategies are not enough. That is where targeted nutrient therapy can play a role.

IV protocols allow for higher concentrations of nutrients to be delivered directly into circulation, which can support energy production, immune function, and recovery in a more immediate way when clinically appropriate.

Vitamin C is one example. It can help modulate histamine levels, reduce inflammation, and support the body during periods of increased demand.

At Markham Integrative Medicine, IV therapy is not a standalone service. It is introduced within a structured plan, after assessment, and used when it fits the clinical picture.

If you are feeling run down or not recovering the way you expect, there may be more to the story.

Comment IV to learn how nutrient therapy is used as part of a broader, individualized approach to care.

Allergies are often treated as isolated reactions to pollen, food, or environmental triggers.In practice, it is rarely t...
05/13/2026

Allergies are often treated as isolated reactions to pollen, food, or environmental triggers.

In practice, it is rarely that simple.

The immune system does not become reactive without reason. It reflects the total load placed on the body over time, including environmental exposures, hormone disruption, gut health, and stress.

This is why symptoms can feel more intense, more unpredictable, and harder to control than they used to. It is not just about what you are reacting to. It is about how your body is processing those exposures.

When we shift the focus toward supporting the system as a whole, the conversation changes and so does the outcome.

Comment ALLERGIES to learn how we approach this from a structured, root-cause perspective.

05/12/2026

Endocrine disruptors are more common than most people realize.

They are found in everyday products, from skincare and cosmetics to plastics, household items, and even some foods. These chemicals can mimic hormones in the body, which means your cells may respond to them as if they were natural signals, even though they are not.

Over time, this can influence hormone balance, immune function, and overall regulation in ways that are not always obvious.

This is why small, consistent changes in what you use daily can make a meaningful difference in reducing overall exposure.

Comment TOXINS to learn how we help patients reduce environmental load in a structured, realistic way.

Sunday morning, coffee, and light reading.Time like this allows for a different kind of thinking. Not just learning some...
05/11/2026

Sunday morning, coffee, and light reading.

Time like this allows for a different kind of thinking. Not just learning something new, but refining how existing knowledge is applied in practice.

Because progress in complex cases is rarely about one idea. It comes from clear thinking, careful prioritization, and knowing what to do first.

05/08/2026

Agricultural chemicals are not theoretical. They are measurable, persistent, and biologically active.

They influence the nervous system, disrupt the microbiome, alter immune signaling, and interfere with hormonal balance. The question is not whether they matter. It is how you manage your exposure.

Reduction matters, but so does capacity.

This is where a structured approach becomes important by supporting detoxification pathways, maintaining nutrient sufficiency, protecting microbiome integrity, and understanding where you may be more susceptible and where intervention is actually required.

Not perfection and not avoidance at all costs, but deliberate reduction, paired with strategic support.

That is how you lower total load and maintain function over time.

Comment DETOX to learn how we help patients support these pathways in a structured, sustainable way.

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300 Main Street Markham N
Markham, ON
L3P1Y8

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