Thyroid Health
Thyroid symptoms are common. The real cause is often missed.
Fatigue, weight changes, hair loss, brain fog, cold intolerance, and mood changes are often written off as “just your thyroid” — treated with a standard medication adjustment and little else. But thyroid dysfunction is rarely isolated. Several factors can disrupt thyroid function long before standard testing catches it.
What disrupts thyroid function
Four factors we look at beyond the gland itself
Iodine
Thyroid hormone production depends on iodine, and both deficiency and excess intake are linked to thyroid dysfunction.
Fluoride
Fluoride can inhibit the sodium/iodide symporter (NIS) responsible for iodine uptake into the thyroid, contributing to impaired iodine absorption and iodine deficiency. Research has found that higher fluoride exposure is associated with reduced thyroid iodine uptake, elevated TSH, and lower urinary iodine concentrations in affected populations.
Gluten
In people with gluten sensitivity or celiac disease, ongoing gluten exposure is associated with autoimmune thyroid conditions like Hashimoto’s thyroiditis.
Infectious disease
Most thyroid symptoms have never had infection properly ruled out. Chronic infections — including Lyme and coinfections — can drive or worsen thyroid dysfunction, and standard Western blot and PCR testing often aren’t sensitive enough to detect them.
Reference ranges
Standard reference ranges may not reflect your ideal range
Most labs still use a broad “normal” TSH range that can miss meaningful dysfunction — especially for women trying to conceive. The Endocrine Society’s guidelines recommend an optimal preconception TSH below 2.5 mIU/L for women before pregnancy or IVF. Some research has specifically categorized TSH between 0.5\u20132.4 mIU/L as the “optimal” range for conception, compared with a “suboptimal” 2.5\u20134.6 mIU/L range — well inside what many standard labs would still flag as normal.
If you’ve been told your thyroid levels are “fine” while trying to conceive or manage symptoms, it may be worth a closer look at where in the range you actually fall.
Common symptoms
Symptoms we evaluate
We evaluate thyroid function alongside a broader picture — including whether an underlying infection may be contributing — rather than treating a lab number in isolation.
See if at-home thyroid testing is right for you
Targeted testing can reveal what standard labs miss — from iodine status to undetected infection.