Does anyone know if these are allowed in a carry on bag? My grandfather is flying in to visit, and he takes a lot of vitamins (B-12, D, etc) that he buys from Target. To be on the safe side, I'm going to advise him to separate them into travel containers, and put them in a ziplock baggy. Will this be ok? He's a very simple person, so I want to make this as easy for him as possible, and he hasn't flown since 2004 before all of this stuff started. He also takes a prescription medication, but I don't know how large it is. Assuming it's over 100 oz, he should alert TSA when he gets in the security line that he has a prescription medication, correct? Or should he just take it out of his bag and put it in a tray? TIA!