Is it possible for me to take garcinia cambogia and levothyroxine?

Unknown: As is true with most supplements, there are no good studies that these supplements do anything beneficial for you. They are not regulated by the fda, instead treated as "food supplements". Most of these are thought not to be harmful, but there are no studies to support this. You should not take any supplement at the same time as the levothyroxine, or else absorption of the med could be affected.