Thyroid & Hormones

The most active thyroid hormone, important in diagnosing an overactive thyroid.

A high level can affect periods, ovulation and fertility in women and men.

The main male hormone — for men with low energy or libido, and for women with polycystic ovaries.

The first thyroid test: picks up an under- or over-active thyroid before symptoms are obvious.

The main hormone made by the thyroid — confirms an under- or over-active thyroid with TSH.