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First, neuropeptides were not considered neurotransmitters until years later

And thats where the other thyroid medications come in Many patients do very well using combination thyroid medications that contain both T4 and T3, not just T4 medication alone

I think they need to do a study using more natural methods to remove iron and publish that

No tolerable upper intake level has been set, because B12 has low potential for toxicity and the body does not hold onto the excess

Neurological symptoms of vitamin B12 deficiency Neurological symptoms affecting your brain and nervous system can include: numbness muscle weakness problems with balance and coordination pins and needles incontinence