Hi everyone. About a year ago I tested just under 200 (blood test). Doc put me on 400mcg daily, so I've taken it for about a year. Recent blood level was 1239. It seems logical that the increase would be solely related to supplementation. However I got somewhat confused reading through that 2013 article which tied in high levels to sinister causes.
While it seems obvious, can I relate this increase to my year's worth of supplementing? I have no symptoms to suggest something going on.