Here is the link.  These people are sounding the alarm!  You must get a blood test to see how low you are.  Some people say, Oh I am taking 1000IU per day.  Well, I needed 50,000 2x a week for months to get up to normal.  Years ago an internist told me to take 400 IU.  What a joke!  I would not be as healthy as I am if I had not acted years ago.  https://www.grassrootshealth.net/  Please tell others about this, celiac or not.