if your looking for sources your in the wrong place.
(i would avoid answering the Emails u'd be getting next with people trying to sell u graet gear).
the dose is 2-15 mcg if i'm not mistaken.
LOL thanks guys. Bstrong...do you know a lot about pets? My dog is so fat some people thought he was a pot-bellied pig. Email me if you can help. Btw, he was fat when I got him!