Confused by a line of a sitcom. I'm watching a old sitcom called The Golden Girls. There's a line I can't understand. Sophia answers the door and find two men look the same, she says:"Hello. Tell me, how many of me do you see?" The one of two men says:"We're twins.", and another one says:"We're here to see Blanche." Sophia says:"So she's taking vitamins again." Why did Sophia say "she's taking vitamins again."?