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Neurotransmitters and Their Purpose
The two major thyroid hormones are triiodothyronine (T3) and thyroxin (T4). Daily production of the thyroid gland is about 80 – 100 micrograms of thyroxin and 20 micrograms oftriiodothyronine. T3 is by far the main thyroid hormone found in the target cells. Its volume of distribution in the human body is 3 - 5 times greater than that of T4.

The daily production and plasma levels of T4 and T3 generally decline with age, favoring the appearance of a clinical syndrome called hypothyroidism.

Thyroid Hormone Deficiency Syndrome

SIGNS
SYMPTOMS
Puffy face & Swollen eyelids
Morning Fatigue
Dry skin & Hair
Somnolence or sleepiness
Diffuse Hair Loss
Slowness
Cold Hands & Feet
Depression
Bradycardia
Lack of Libido (Women)

Treatment of Thyroid Hormone Deficiency
Different thyroid preparations are sold on the market today. The most frequently prescribed contains only of the thyroid hormones. T4, but others can contain T3 alone and finally, a combination of T4 and T3 either as a mixture or as desiccated thyroid from animal origin. However, according to Thierry Hertoghe, MD, a world-recognized leader in clinical endocrinology, thyroid hormone replacement therapy is best done with prescriptions that contain both T and T3.