I got called away so here's the rest.
The main problem with these "miracle" pills, potions, etc. Is that a) the ingredients are mostly unproven with few or no studies to back up the claims, b) the few things that might work are often not present in dosages that are effective or may not be present as claimed, c) toxicity and the effects of long term use are not evaluated, d) often there are substances present that are not disclosed.
There was a recent case of herbal supplements that contained anabolic steroids. You're a sixteen year old girl, do you really want to be a boy when you're seventeen? Anabolic steroids have a masculinizing effect on women.
In the case of that stuff you're taking, it claims to affect the thyroid. When doctors prescribe thyroid medication, the patient is very closely monitored. This is not something to mess with on your own.
Look at it this way-if the pills really rev up your thyroid, you are facing medical consequences, if they aren't strong enough to do that, THEY DON'T WORK and you're being ripped off.
"To give anything less than your best is to sacrifice the Gift."