All About Thyroid
A System-Based Approach
Thyroid Support
Understanding Thyroid Hormones: T4 vs. T3
The thyroid produces two primary hormones:
T4
(Thyroxine): The inactive storage form
T3
(Triiodothyronine): The active form used by the body
For proper metabolic function, the body must convert T4 into T3.
If this conversion process is impaired, individuals may experience symptoms of low thyroid function, even when standard lab values appear within range.
Where Thyroid Function Is Regulated
Thyroid activity is influenced by multiple systems in the body:
Liver
Responsible for approximately 60% of T4 to T3 conversion
Gastrointestinal system
Contributes to hormone activation and nutrient absorption
Endocrine signaling
(including stress response)
Regulates hormone production and utilization
Where Conversion Happens
60%
In the Liver
20%
In the Gut
20%
Never Converts
Why Thyroid Imbalances Are Frequently Misinterpreted
In many cases, individuals are evaluated primarily through
TSH (thyroid-stimulating hormone) levels.
While useful, TSH does not provide a complete picture.
While useful, TSH does not provide a complete picture.
Elevated TSH may indicate the body is signaling for more thyroid hormone
However, this does not necessarily mean the thyroid is not producing hormones
It may instead reflect an issue with
conversion or utilization
As a result, underlying factors such as liver function, gut health, or chronic stress, are often overlooked.
What Affects Thyroid Conversion
1
Liver Function (the biggest driver)
Your liver is responsible for the majority of T4 → T3 conversion.
When it’s sluggish:
When it’s sluggish:
- Detox pathways slow down
- Hormones aren’t processed properly
- Conversion drops
2
Gut Health
Your microbiome plays a direct role in hormone activation.
Imbalances can:
Imbalances can:
- Disrupt conversion
- Increase inflammation
- Interfere with absorption of key nutrients
3
Stress & Adrenals
Chronic stress shifts your body into survival mode.
This:
This:
- Suppresses thyroid function
- Prioritizes cortisol over metabolism
- Slows conversion
4
Nutrient Deficiencies
Your body needs specific nutrients to convert thyroid hormones properly:
Without them, conversion becomes inefficient.
- Selenium
- Zinc
- B Vitamins
- Amino Acids
Without them, conversion becomes inefficient.
A Structured Approach to Thyroid Support
Rather than addressing the thyroid in isolation, a more effective strategy is to support the systems that regulate it.
This structured approach:
- Addresses hormone production, conversion, and utilization
- Supports the liver, gut, and endocrine signaling pathways
You want to:
1
Prepare the body
2
Support conversion pathways
3
Then target the thyroid directly (if needed)
Additional Resources
For a more in-depth understanding of thyroid physiology,
hormone conversion, and common clinical patterns:
hormone conversion, and common clinical patterns: