Originally Posted by
svenskaflicka
My husband carries all his supplements in his carry on (about eight bottles) and has never had an issue at the checkpoint. The only ones I might worry about would be the softgels if they ever opened your carry on for some other reason.
It all depends on the mood of the TSA clerks.
My recommendation is that if you're carrying a lot of supplements/pills, either bring them in their original containers or be able to easily recognize/describe them all (with or without documentation).
About 2 years ago I followed 3 WWF wrestling athletes through a GRB checkpoint. Aside from the comical scan/pat-down (one was heavily pierced everywhere); there was a bit deeper exploration of a bag that appeared to have a lot of supplements in baggies, etc and smaller vials of liquid (properly bagged up). I didn't stay long enough to see what the end results were; but it appeared an extended but reasonable conversation.
To those asking about Singapore; things ramp-up if you're going internationally when border patrol on either side can get involved if you're carrying anything perceived to be of a controlled substance.
Anything seen as excessive (i.e. "unlimited amounts") will have even deeper scrutiny as even body-building supplements are controlled differently in every country. Excessive amounts also may imply an intent to distribute and you're then in an even more dicey area.