#symptoms #hypothyroidism #normal #TSH
The role of T3, conversion and liver in subclinical hypothyroidism
When TSH is “normal” but you feel worse and worse…
Many patients, especially women, come to the doctor with symptoms typical of hypothyroidism: chronic fatigue, freezing, hair loss, problems with concentration, weight gain or depressed mood. However, in laboratory tests, TSH is… normal. What then?
The key may not be TSH but the level of free triiodothyronine (fT3), the active thyroid hormone. If the conversion of T4 (thyroxine) to T3 is impaired, cells may suffer from a functional thyroid hormone deficiency even though TSH is still within the laboratory “normal” range.
The role of T4 to T3 conversion – what disturbs it?
Thyroxine (T4) is an inactive form that must be converted to the active triiodothyronine (T3) in order to affect metabolism. The conversion process takes place mainly in the liver, intestines and kidneys, and its proper course depends on many factors:
- selenium and zinc deficiencies, which are cofactors of deiodinase enzymes;
- chronic stress – excess cortisol inhibits conversion;
- inflammation and infections (even latent) that shift the conversion towards inactive reverse T3;
- disorders of liver function and intestinal microbiome.
Therefore, if the liver is not functioning properly, the intestines are permeable or the bacterial flora is disturbed – the production of active T3 may decline, even though TSH looks “nice” on paper.
The liver – the silent hero of hormonal balance
The liver does more than filter toxins and regulate glucose levels. It is also a key site for the conversion of T4 to T3. Disturbances in its function, steatosis, excess estrogen, abuse of drugs or alcohol – all this reduces the availability of active T3.
In such cases, supporting liver detoxification and intestinal microbiota may improve thyroid metabolism even without changing the levothyroxine dose.
Symptoms of T3 deficiency despite “good” TSH
If you have a normal TSH but suspect an active T3 deficiency, look out for symptoms such as:
- brain fog, slowed thinking;
- cold hands and feet, constant feeling of cold;
- dry skin, constipation, hair loss;
- inability to lose weight despite dieting;
- depression, low motivation;
- irregular periods or PMS.
It is worth asking the doctor to extend the diagnostics to include fT3, fT4, anti-TPO and anti-TG antibodies and assess the level of ferritin, vitamin d3, zinc, selenium and homocysteine.
How to support the conversion of T4 to T3? supplements Calivita
In therapy supporting the conversion of T4 to T3, it is worth choosing preparations that support the liver, intestinal microbiome and provide the necessary micronutrients:
Liver Aid – a comprehensive preparation supporting liver function and detoxification. Contains milk thistle, choline and inositol, which support the regeneration of liver cells and optimize hormone metabolism.
Pure Inulin – prebiotic fiber supporting healthy intestinal bacterial flora, necessary for the conversion and absorption of nutrients.
ProSelenium – organic selenium, necessary for the action of deiodinase that converts T4 into T3. It also protects against autoimmunity in Hashimoto’s disease.
Chelated Zinc – zinc in an easily absorbable form, which acts as a cofactor in the metabolism of thyroid hormones and supports immunity and tissue healing.
Stress Management – B vitamins support the nervous system, cortisol regulation and the functioning of the liver and thyroid gland.
Not just hormones – a functional approach
Many patients with symptoms of hypothyroidism need not only levothyroxine, but also conversion support, improvement of intestinal and liver function, and reduction of stress levels. This functional approach gives lasting effects and improves the quality of life – even if the TSH test is unremarkable.
Intestinal microbiota – a hidden player in thyroid hormone conversion
A growing body of research shows that gut health has a direct impact on thyroid function, especially the conversion of T4 to T3. Intestinal bacteria participate in the metabolism of hormones and their activation, as well as in the elimination of excess estrogens, which can disrupt the hormonal balance. Dysbiosis, i.e. disturbed microbiota composition, can lead to inflammation and impaired absorption of selenium, zinc and iron – crucial for the thyroid gland. In this context, it is worth reaching for proven probiotics, e.g. AC-Zymes Plus From Calivitawhich supports the balance of intestinal flora.
Summary
Normal TSH does not rule out thyroid problems. It is crucial to understand how active T3 hormone is produced and what influences its level. Support for the conversion of T4 to T3 through an appropriate diet, liver regeneration, microbiome and supplementation with preparations Calivita can bring real improvement in health and well-being.
