Still Have Thyroid Symptoms on Medication? A Naturopathic Doctor's Root-Cause Approach to Thyroid Treatment
You take your thyroid medication every day. Your doctor says your TSH is normal. And you're still exhausted, foggy, gaining weight and losing hair. You're not imagining it, and you're not out of options.
I'm Dr. Elie Klein, ND. In 23 years of clinical practice, I've seen this pattern again and again: people who are doing what they were told and still don't feel well.
Who this page is for
This page is for you if you take levothyroxine (Synthroid, Eltroxin) or another thyroid medication and you still have symptoms such as:
- Fatigue that sleep doesn't fix
- Brain fog, poor memory or trouble concentrating
- Weight gain or difficulty losing weight
- Hair loss or thinning hair
- Feeling cold all the time
- Constipation
- Dry skin and brittle nails
- Low mood or anxiety
- Muscle aches and joint pain
- Poor sleep
It's also for you if your TSH came back "normal" and you were told your thyroid is fine, or if you have Hashimoto's thyroiditis and feel that treatment hasn't gone far enough.
Ready to talk? Start with a free 15-minute conversation, or book your first consultation.
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Why you can still feel hypothyroid while on levothyroxine
Levothyroxine is a synthetic form of T4, the less active thyroid hormone. T4 is largely a storage form. The hormone that runs your cells is T3, the active form, and your body has to convert T4 into T3.
When that conversion doesn't happen properly, your blood test can show a comfortable T4 and a normal TSH while your tissues are still short of active hormone. That's why symptoms of low thyroid can continue even when you take your medication faithfully.
Blood levels don't always reflect what's happening inside your tissues. A T4, a T3, or even a normal TSH can't tell the whole story. The more useful question is: what is getting in the way of conversion?
Root causes of poor thyroid function
Common causes include nutritional deficiencies, a variety of stressors, extreme dieting, and hormonal imbalances. Finding which of these applies to you is the heart of the work.
A simple thyroid check you can do at home
Check your temperature first thing in the morning, before you get out of bed, for several mornings in a row. If it is consistently below 36.5°C, it suggests that your thyroid function may be suboptimal. This is a simple screening check, not a diagnosis, but it's a useful clue to bring to your consultation.
Is the "normal" TSH range too wide?
In my opinion, the TSH range most doctors follow is too wide. Papers presented at conferences of thyroid specialists and endocrinologists have argued for a narrower range. I consider an ideal TSH to be around 1.5, and ideally closer to 1 or lower.
But a number on a lab report is not the goal. The goal is that your symptoms go away. We use your labs as a guide, and we measure success by how you feel.
What I look at: a functional medicine approach to thyroid testing
Standard thyroid testing often stops at TSH. I look further:
- Free T4 and free T3, which show what's available to your body
- Reverse T3, where it can be obtained. It shows whether too much T4 is being wasted instead of converted to active T3
- Estrogen-to-progesterone ratio
- Cortisol-to-DHEA ratio
- Blood sugar control
- Inflammatory markers
Each of these can interfere with thyroid function. Finding which ones are blocking you lets us treat the cause, not just the number.
Thyroid hormone support: desiccated thyroid and T3
When thyroid hormone support needs to be adjusted, options such as desiccated thyroid and T3 therapy can be discussed. The dose and the ratio of T4 to T3 matter a great deal, and I give them careful consideration whenever they're part of a plan.
How we work together
- Before your visit: you complete a health questionnaire and send me your recent lab work.
- Your consultation: a one-on-one video visit where we go through your history and symptoms, unhurried.
- Targeted testing: only what's needed to find what's blocking your thyroid function.
- Your plan: a personalized diet plan, plus my support in putting it into practice.
- Follow-up: we track your symptoms and labs together and adjust.
My approach isn't meant to replace your doctor's treatment. It's meant to complement it, and, ideally, to support and improve it.
What we aim for
Energy that returns, clearer thinking, hair that stops falling, easier weight management, feeling warm again, regular digestion, better mood and sleep. If you'd like to find out what kind of results other people have had, reach out to me and I'll send you a link.
Virtual care across Ontario, or in person in Vaughan (Greater Toronto Area)
Appointments are by secure video from the comfort of your home, anywhere in Ontario. If you prefer a one-on-one visit in person, you're welcome to come to my home office in Vaughan, in the Greater Toronto Area. Most extended health plans in Ontario cover naturopathic care.
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Related reading
- Hormone imbalance: a naturopathic doctor's guide to root causes and natural treatment
- Menopause symptoms: a naturopathic approach to hot flashes, sleep and mood
Frequently asked questions
Why do I still have symptoms on levothyroxine?
Levothyroxine is T4, which your body must convert to active T3. If conversion is impaired, you can stay symptomatic while your TSH and T4 look acceptable. Common causes include nutritional deficiencies, stress, extreme dieting, and hormonal imbalances.
Can I have a normal TSH and still have hypothyroid symptoms?
Yes. A normal TSH means your pituitary gland isn't signalling for more hormone. It doesn't confirm that your cells are getting enough active T3.
What is the ideal TSH level?
Lab ranges are wide. In my opinion, an ideal TSH is around 1.5 or lower. Your symptoms matter more than any single number.
What is reverse T3, and should I be tested?
Reverse T3 is an inactive form made from T4. A high level suggests T4 is being diverted instead of converted to T3. Where the test is available, it can be a useful clue.
How can I check my thyroid at home?
Take your temperature first thing in the morning, before getting out of bed. A reading that is consistently below 36.5°C suggests suboptimal thyroid function.
Is there a natural treatment for hypothyroidism?
Natural thyroid treatment, as I practise it, means finding and addressing what's blocking your thyroid hormone from working, through nutrition, hormonal balance, blood sugar control and lowering inflammation, as a complement to your doctor's care.
Do you use desiccated thyroid or T3?
These options can be discussed. The dose and the T4-to-T3 ratio are important, and I give them careful consideration.
Do you work with Hashimoto's thyroiditis?
Yes. Hashimoto's is one of the most common reasons people stay symptomatic on medication, and I approach it the same root-cause way.
Can thyroid care be done virtually?
Yes. We work by video, and I review your existing labs and recommend further testing if needed.
About your naturopathic doctor: I graduated from the Canadian College of Naturopathic Medicine in 2003 and have 23 years of clinical practice. I'm registered with the College of Naturopaths of Ontario (CONO registration #1190) and I'm the author of Read This If You Have a Heart. Last updated: November 2026.
This page is educational and isn't meant to replace your doctor's care.
