Dear Janet, thank you for your message.
I have been studying and researching the biology of silicon for more than 30 years and there is only one way that silicon could influence thyroid metabolism and that is by influencing aluminium toxicity in the body. It can only influence aluminium toxicity through its actions as silicic acid, not silica. Silica taken orally will release very small amounts of silicic acid but in the main it will move through the gut unchanged to be excreted in the faeces. Silica is a very 'sticky' substance which means that many things in the gut may adsorb to its surfaces and thus it may help to remove gut contents via the faeces.
Silicon in silicon-rich mineral waters, see attached, is in the form of silicic acid which essentially follows water throughout the body being excreted eventually in the urine and also in sweat. If you drink a silicon-rich mineral water on a regular basis, for example 1L/day, then your body fluids will equilibrate to a a higher level of silicic acid then would normally be the case and provide a constant protection against the possible toxicity of aluminium.
Aluminium has been shown to influence thyroid metabolism and so it is not a surprise to hear that regular drinking of a silicon-rich mineral water might benefit individuals suffering from issues relating to their thyroid.
I hope that the attached Fact Sheet and the posts on my medical blog ( hippocraticpost.com/?s=Exley ) will be helpful to you and those using your various forums.
Do feel free to get back in touch should you have any further questions.
Best wishes
Chris
[ Edited by admin to add a space before the ")" at the end of the link. This allows it to work, otherwise the ")" is treated as part of the link. ]