I'm 57yr old, fairly healthy, I do take med for Thyroid problems. I take a mulit vitamin, V-d3, & my Thyroid daily & have for years,, will Thyroid for just the last 2 years... For 8 days now I get a metal taste in my mouth after I been a wake for 3-4 hours & last all day, does go away after I eat for like 30 mins then is back... what is it?