My friend says he's growing... ****?

So my friend strangely told me tonight that he's been growing apparently. He thinks its because of those gummy bear vitamins he's been taking, but I've taken food science and I know that no overdose of any vitamin results in... ya. So any takers on what this might be? he's generally a lanky guy he's been like 20 pounds lighter than me for as long as I've known him and he's probably 2 inches taller I'd say about 5'5" and around 120 pounds. He generally has a weak stomach so the only other over the counter he's likely to use is pepto bismol which even that in large quantities will just make your poop weird. He's 18, doesn't smoke, doesn't drink, and uh... thats about all I can give for relative info on this topic.