The Wilson's T3 Protocol (WT3): A Step-by-Step Guide for Canadians

If you have been diagnosed with or suspect you have Wilson's Temperature Syndrome, you already know the basics: your body temperature runs low, your metabolism is stuck, and standard thyroid medication has not fixed it. What you need now is a plan. The Wilson's T3 protocol --- also known as the WT3 protocol --- is the structured, cyclical approach developed by Dr. Denis Wilson to reset your metabolic thermostat using slow release T3. This guide walks you through exactly how it works, step by step.

The WT3 protocol is not guesswork. It follows a precise methodology of ramping, holding, and tapering designed to break the cycle of impaired T4-to-T3 conversion and restore normal body temperature. For Canadians who have spent years hearing that their labs are "normal," understanding this protocol is often the turning point.

Before reading this guide, you should be familiar with the underlying condition. Start with our comprehensive Wilson's Temperature Syndrome guide if you have not already.

The Theory Behind the WT3 Protocol

To understand why the Wilson's T3 protocol works the way it does, you need to understand what has gone wrong in your body and why it has not corrected itself.

Under normal conditions, your thyroid produces T4, which your liver, kidneys, and peripheral tissues convert into active T3 via deiodinase enzymes. T3 enters your cells, drives metabolism and heat production, and your body temperature stays close to 37.0 degrees Celsius (98.6 degrees Fahrenheit).

When you experience a significant stressor --- chronic illness, trauma, surgery, prolonged caloric restriction, pregnancy, or major infection --- your body shifts T4 conversion away from active T3 and toward reverse T3 (rT3). Your metabolism slows, your temperature drops, and your body conserves energy. The problem is that in many people, especially after prolonged or repeated stressors, this shift becomes self-sustaining.

Even after the original stressor resolves, the body remains locked in a low-temperature, high-rT3 state. Reverse T3 blocks T3 receptors, conversion enzymes stay suppressed, and the cycle feeds itself. Your thermostat is stuck, and it will not reset on its own.

Why Levothyroxine Cannot Break the Cycle

If the problem is impaired T4-to-T3 conversion, giving more T4 (levothyroxine) cannot solve it. You are adding more raw material to a system that has forgotten how to process it. The extra T4 simply gets converted into more reverse T3, which deepens the blockade. This is why so many Canadians on Synthroid or Eltroxin continue to feel terrible despite "optimal" TSH levels.

What T3 Cycling Does Differently

The Wilson's T3 protocol bypasses the broken conversion machinery by delivering active T3 directly to your cells. But the cycling approach --- ramping up, holding, then tapering off --- does more than just supplement what is missing. By supplying exogenous T3 in gradually increasing doses, you suppress TSH and reduce T4 production, which starves out reverse T3. Once rT3 clears, you taper off the T3, allowing your own thyroid axis to resume production. With reverse T3 no longer blocking the receptors, your natural conversion can re-establish itself at a normal set point.

If one cycle does not fully reset the system, you begin another at a slightly higher starting dose. Each cycle clears more reverse T3 and pushes the thermostat closer to 37.0 degrees Celsius.

Why Slow Release T3 Is Essential

The Wilson's T3 protocol was specifically designed for slow release T3. This is not optional. Instant-release T3 (Cytomel) does not work for this protocol, and attempting to substitute it is one of the most common mistakes people make.

The entire premise of the WT3 protocol rests on the steadiness principle: your body temperature must rise and stabilise at a consistent level, not spike and crash throughout the day. When you take instant-release T3, serum levels shoot up sharply within two to four hours, then drop just as fast. This produces temperature fluctuations that your body interprets as stress, triggering further reverse T3 production.

Slow release T3 dissolves gradually over eight to twelve hours, producing a flat, sustained elevation in serum T3. Research confirms that compounded slow-release T3 capsules achieve a much flatter pharmacokinetic curve compared to instant-release formulations. This steadiness is what allows the metabolic thermostat to actually reset.

For a detailed comparison of these two delivery methods, see our guide on slow release T3 vs Cytomel.

The WT3 Protocol: Step by Step

What follows is the standard Wilson's T3 protocol framework. Individual practitioners may adjust specific details, but the core structure --- ramp, hold, taper --- remains consistent.

Step 1: Establish Your Baseline

Before you begin the protocol, you need a clear snapshot of where you are starting from. This baseline is essential for tracking progress and knowing when the protocol is working.

Temperature baseline: Take your oral temperature three times daily --- mid-morning, mid-afternoon, and early evening. Avoid measuring immediately after eating, drinking, or exercising. Record all three readings, calculate your daily average, and do this for five consecutive days. Most people entering the WT3 protocol will average between 35.8 and 36.6 degrees Celsius. For a detailed walkthrough, see our guide on low body temperature and thyroid function.

Lab work: Request Free T3, Free T4, Reverse T3, and TSH before starting. An rT3-to-FT3 ratio above 10 strongly suggests reverse T3 dominance and confirms you are a candidate for the protocol.

Symptom log: Rate your current symptoms on a scale of 1 to 10 --- fatigue, brain fog, cold intolerance, weight, mood, pain, and sleep quality. You will be grateful for this record eight weeks in.

Step 2: Start with a Low Dose of Slow Release T3

The Wilson's T3 protocol begins conservatively. The standard starting dose is 7.5 mcg of slow release T3, taken twice daily --- once in the morning upon waking and once in the early afternoon (around 12 to 2 PM). The doses should be spaced approximately eight to twelve hours apart to maintain steady serum levels.

The SRT3-7.5 is the ideal starting capsule for the WT3 protocol. It provides the precise low dose needed for the initial phase without requiring you to split larger capsules.

At this starting dose, you may not feel much of anything. That is expected. The goal is to introduce T3 gently while you establish the monitoring rhythm that will guide the rest of the protocol. If you are currently taking levothyroxine, discuss with your practitioner whether to continue it during the cycle.

Step 3: Monitor Temperature Daily

Temperature monitoring is the engine of the WT3 protocol. Without it, you are flying blind. Continue taking your temperature three times daily at the same times. Calculate and record your daily average. Two things matter equally:

1. Is the average rising toward 37.0 degrees Celsius? This tells you the dose is working.
2. Is the average stable from day to day? Wide swings indicate the dose or timing needs adjustment. Stability must come before further increases.

This temperature log becomes the single most important document in your protocol.

Step 4: Increase the Dose Gradually

If your temperature has not reached 37.0 degrees Celsius after several days at the starting dose, and your readings are stable, it is time to increase. The standard increment is 7.5 mcg per dose every three to seven days:

• Days 1-5: 7.5 mcg twice daily (15 mcg total)
• Days 6-10: 15 mcg twice daily (30 mcg total)
• Days 11-15: 22.5 mcg twice daily (45 mcg total)
• Days 16-20: 30 mcg twice daily (60 mcg total)

These timeframes are approximate. The critical decision point is your temperature data, not the calendar. Only increase when readings are stable but below target. If readings are fluctuating, hold the current dose until they stabilise.

As your dose rises, you may transition from the SRT3-7.5 to the SRT3-15 for convenience. For a comprehensive breakdown of T3 dosing increments, see our T3 dosage protocols guide.

Step 5: Hold at the Optimal Dose

When your daily average temperature reaches and consistently holds at 37.0 degrees Celsius (98.6 degrees Fahrenheit) --- or as close to it as you can get with stable readings --- you have found your optimal dose. This is the dose that has provided enough T3 to fully compensate for your conversion deficit and restore normal metabolic function.

Hold this dose for a minimum of two to four weeks. Some practitioners recommend holding for six to eight weeks, particularly for patients who have been symptomatic for years. The purpose is to allow your body to acclimate to the normal temperature, clear residual reverse T3, and begin resetting deiodinase enzyme activity.

Continue monitoring your temperature daily during this phase. If it drops significantly on the same dose, you may need to increase slightly. If it rises above 37.0 degrees Celsius consistently, reduce.

Step 6: Taper Off --- The Weaning Cycle

The taper is where the "reset" actually happens. Once you have held at the optimal dose long enough for temperature to stabilise, begin reducing in reverse increments --- typically 7.5 mcg per dose every two to three days. The taper is somewhat faster than the ramp-up because your body has already adjusted to the higher metabolic rate.

Continue monitoring temperature closely. If your temperature holds as you reduce each step, your own thyroid axis and conversion enzymes are taking over. If it drops below target, note the dose at which it dropped. Complete the taper to zero, wait three to five days, and assess your temperature off all T3.

Step 7: Assess and Decide on Further Cycles

After completing the taper and spending several days off T3, check your average temperature.

If your temperature holds at or near 37.0 degrees Celsius: The protocol has succeeded. Continue monitoring periodically, but no further cycles are needed.

If your temperature drops back down: This is common, especially after the first cycle. Begin a new cycle at a slightly higher starting dose --- for example, if your first cycle started at 7.5 mcg twice daily, start the second at 15 mcg twice daily. Most people require one to three cycles to achieve a lasting reset.

The Steadiness Principle: Why Consistency Is Everything

If there is one concept that defines the success or failure of the Wilson's T3 protocol, it is steadiness. It is not enough for your temperature to reach 37.0 degrees Celsius occasionally. It needs to be stable from reading to reading and day to day.

Temperature fluctuation undermines the protocol because your body interprets instability as metabolic stress and continues producing reverse T3 as a protective response. The thermostat cannot reset in a turbulent environment. It needs calm, steady signalling to recognise that normal metabolic function is safe.

Take your doses at the same times every day. Do not skip doses or double up. Use slow release T3 exclusively. These are not suggestions --- they are load-bearing pillars of the protocol.

Common Mistakes That Undermine the Protocol

Having walked through the protocol step by step, here are the errors that most frequently prevent it from working:

Using instant-release T3 instead of slow release. Cytomel produces the spike-and-crash pattern that actively works against the steadiness principle. If you cannot obtain slow release T3 through a compounding pharmacy, see our guide on how to get slow release T3 in Canada.

Increasing the dose too quickly. Jumping doses before your temperature readings stabilise defeats the purpose. Each increase should be validated by stable temperature data.

Not monitoring temperature. Without temperature data, you cannot know whether the dose is working or when to hold and taper.

Inconsistent dosing times. Taking your morning dose at 7 AM one day and 10 AM the next introduces variability. Set alarms if necessary.

Stopping abruptly instead of tapering. The taper is where the reset occurs. Stopping abruptly denies your body the chance to resume its own T3 production and can cause a rebound crash.

Ignoring adrenal status. If adrenal function is compromised, you may not tolerate increasing T3 doses. Signs include worsening fatigue, dizziness, and palpitations. Supporting adrenal function before or during the protocol may be essential.

Temperature Monitoring Best Practices

Since temperature is the primary guidance tool for the entire Wilson's T3 protocol, accuracy matters enormously. Use the same reliable digital oral thermometer throughout --- different devices can vary by several tenths of a degree. Ear, forehead, and armpit measurements are less reliable for this purpose.

Measure at the same three times daily (mid-morning, mid-afternoon, early evening). Wait at least 20 minutes after eating or drinking before taking a reading, and hold the thermometer in place for two to three minutes even if it beeps sooner. Digital thermometers sometimes give a preliminary reading before reaching true equilibrium.

Focus on the daily average, not any single reading. A single measurement of 37.0 degrees Celsius means little if your other two readings are 36.2 and 36.4. Track your daily averages on a simple line graph. You want to see a smooth upward trend, not a jagged zigzag.

What to Expect During the Protocol

During the ramp-up: Most people notice subtle improvements in energy and warmth within the first one to two weeks. Brain fog often starts lifting before temperature reaches the full target. Some people experience mild headaches or brief fatigue as the body adjusts. These typically resolve within a few days.

During the hold phase: This is where the most significant symptom improvement occurs. With temperature stabilised at the target, you may notice improvements in mood, mental clarity, weight management, and cold tolerance.

During the taper: Anxiety about symptom return is common. Monitor temperature objectively rather than relying on feelings alone. Mild energy fluctuations are normal as your own thyroid axis reactivates.

Between cycles: If your temperature drops after the first cycle, do not be discouraged. Each cycle builds on the progress of the previous one.

Frequently Asked Questions

What is the WT3 protocol?

The WT3 protocol is a structured treatment approach developed by Dr. Denis Wilson for Wilson's Temperature Syndrome. It uses slow release T3 in carefully managed cycles of ramping, holding, and tapering to reset the body's metabolic thermostat. Unlike simple T3 supplementation, the protocol aims for a lasting reset that allows your own thyroid function to resume normally after the T3 is withdrawn.

How long does a Wilson's T3 cycle last?

A single cycle typically lasts four to twelve weeks. The ramp-up phase usually takes two to four weeks, the hold phase lasts two to eight weeks, and the taper takes one to two weeks. If an additional cycle is needed, most practitioners recommend waiting three to five days between cycles before beginning the next one at a higher starting dose.

Why does the WT3 protocol require slow release T3?

The protocol depends on the steadiness principle --- maintaining stable T3 levels throughout the day so that body temperature rises and holds without fluctuation. Instant-release T3 (such as Cytomel) produces spikes and crashes that cause temperature instability, which signals metabolic stress and triggers further reverse T3 production. Only slow release T3, dissolving gradually over eight to twelve hours, can produce the flat, sustained hormone levels the protocol requires.

Can Wilson's Temperature Syndrome be cured?

Many people achieve a lasting reset through the WT3 protocol and do not need to continue taking T3 indefinitely. In this sense, WTS can be resolved rather than merely managed. However, the underlying vulnerability remains, and future stressors could potentially trigger a recurrence. If that happens, another cycle can reset the system again, typically more quickly than the initial round.

What is the right starting dose for the Wilson's T3 protocol?

The standard starting dose is 7.5 mcg of slow release T3 taken twice daily (15 mcg total per day). Some practitioners start even lower for elderly patients, those with cardiovascular concerns, or signs of adrenal insufficiency. The SRT3-7.5 capsule was designed for this initial phase.

How do I know when my dose is high enough?

Your body temperature tells you. When your daily average oral temperature consistently reaches 37.0 degrees Celsius (98.6 degrees Fahrenheit) and holds there steadily for several consecutive days, you have reached the optimal dose. Symptom improvement is an important secondary indicator, but temperature is the primary objective measure.

Can I do the Wilson's T3 protocol while taking levothyroxine?

This depends on your practitioner's approach. Some protocols call for discontinuing levothyroxine entirely, while others maintain a reduced T4 dose alongside the T3. The rationale for stopping T4 is that continuing to supply it while conversion is impaired generates more reverse T3 --- exactly what you are trying to clear. Discuss the best approach with a knowledgeable practitioner.

What happens if my temperature does not reach 37.0 degrees Celsius?

If your temperature plateaus below the target despite dose increases, several factors may be at play. Adrenal insufficiency can limit how much T3 your body can utilise --- low cortisol may cause anxiety or palpitations before reaching the temperature target. Nutritional deficiencies in selenium, zinc, or iron can also impair the response. In some cases the dose simply needs to go higher, though this should always be done incrementally. If temperature remains below target at the maximum tolerated dose, addressing adrenal health, nutrient status, and underlying inflammation may be necessary before the next cycle.

Moving Forward

The Wilson's T3 protocol is not a quick fix. It requires patience, discipline, and consistent monitoring. But for Canadians trapped in a low-temperature state that conventional medicine cannot explain, it offers something rare: a path to resolution, not just management.

If you are ready to begin, the SRT3-7.5 Slow Release T3 is the recommended starting point. For higher doses during ramp-up, the SRT3-15 Slow Release T3 provides a convenient step up. And if you are still working out how to access these products, our guide on how to get slow release T3 in Canada covers every available option.

Your temperature is not a personality trait. It is a metabolic signal. And with the right protocol, it can be corrected.