"older medical articles revealed that fluoride was once used as an anti-thyroid medicine, prescribed by doctors in hospitals and clinics. It was used to slow down an overactive thyroid. In addition, it was also effective in slowing down a normal or already-sluggish hypothyroid gland. For instance, in the Journal of Clinical Endocrinology, Volume 18, 1958, page 1102, Drs. Galetti and Goyer explain the "Effect of Fluorine in Thyroidal Iodine Metabolism in Hyperthyroidism"."

- http://www.thyroid-info.com/articles/shamesfluoride.htm


"Fluoride had been used for decades as an effective anti-thyroid medication to treat hyperthyroidism and was frequently used at levels below the current "optimal" intake of 1 mg/day. This is due to the ability of fluoride to mimic the action of thyrotropin (TSH)."

"Fluoride and iodine, both being members of the halogens group of atoms, have an antagonistic relationship. When there is excess of fluoride in the body it can interfere with the function of the thyroid gland."

- http://thyroid.about.com/cs/toxicch.../flouride_2.htm


"Although there have been numerous studies before showing that fluorides act like TSH, the thyroid-stimulating-hormone - as seen above -, it can now be documented in deep detail, for it is known that G proteins in thyroid physiology are normally absolutely dependent on TSH and are inactive without it. TSH is the master, sometimes also referred to as the “first violinist in the orchestra”.

The TSH receptor is the only receptor known able to activate all G protein families, an activity directly imitated by fluoride. "

- http://64.177.90.157/pfpc/html/thyroid_history.html


"Karilee Shames, RN, PhD, Assistant Professor of Nursing, points out that a major environmental trigger of low thyroid is likely to be the fluoride added to municipal water supplies. Scientists believe that fluoride can depress thyroid functions with levels as low as 2. 5 mg/ day"

- http://www.healthy-communications.c...amesreport.html


For those that still have their thyroid I can see where there would be reason for concern.

For those of us that no longer have a thyroid or have a thyroid that no longer works it appears that fluoride is not a problem for our T3 &/or T4 replacements as the interferrence is with TSH.