I am mercury poisoned and I have to take 100 microgram levotiroxin to support my thyroid gland and keep me alive. I carried out a lot of experiment with food and drink. After drinking very cold water I always have mercury symptoms. Well, clean water is no reason for insulin production but the fact that it is very cold is a reason for thyroid hormone production. Thyroid hormone level increase in the blood however should not cause mercury symptoms unless the hormone itself is mercury contaminated. My opinion is that our hormones are all mercury contaminated and insulin is probably not an exception.