Hi Penelope, I completely understand why you've taken supplements to try to help yourself & I'm all in favour of taking responsibility for our own health, but I just want to echo what Stellajane (I think) said earlier, i.e. that iodine supplements should be avoided by anyone already on thyroid replacement. The British Thyroid Foundation is very clear about that. If I understand correctly, you're not on thyroid replacement, but there may be others reading this thread who are.
I would also urge caution with selenium (& variably concentrated food sources of it such as brazil nuts) when on thyroid medication, as this mineral can markedly increase conversion of T4->T3, potentially resulting in levels of thyroid hormones that are too high. Magnesium can have a similar effect.
Please be very careful/vigilant with any supplements you take Penelope - if you already have a goitre I worry that supplements that have the power to influence thyroid function could have adverse effects on your thyroid condition.
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I think we all need to be especially careful with supplements when on Thyroxine, as undesirable interactions are possible. Calcium is another widely publicised example - if we need to take this it should be at least 4 hours away from any dose of thyroid replacement. I think someone else (Kathleen perhaps) may have already mentioned this elsewhere, but I think it bears repeating as no-one wants to upset delicate thyroid balance when it's already compromised.
I do take Vit D daily, B12 twice a week & B-group every day. The Vit D was prescribed for me because my level was found to be suboptimal a few years ago & this has since been monitored to make sure the dose I'm on is right. As my B12 has also been on the low side whenever tested, my Endocrinologist agreed it's sensible to take this on a maintenance basis, but I only take the lowest dose I can find, as a higher strength formulation took my levels right to the top of the ref range which my GP was unhappy with. I also take B-group at the basic RNI - a level which should not cause any harm, but there was a long period of time when I couldn't even take that as it seemed to rev my thyroid uncomfortably - something none of us would want to do deliberately. I make sure to have regular TFTs & always arrange one at any time I suspect my dose may need tweaking. Not so easily done if reliant on the NHS for testing, so very important to be especially careful not to upset the apple cart in those circumstances.
I always check with my Endocrinologist and any other medics whose long-term care I'm under, to make sure they're happy for me to supplement, as I very much feel treatment needs to be a partnership & I want to avoid doing anything that might jeopardise their best efforts to keep me well.