Maybe experiment isn't the best word because this wasn't exactly scientific.
After reading about Centrum not dissolving in the stomach (something about x-rays of un-dissolved vitamins), I decided to do a little test/experiment/whatever.
I put about 1/2 c. water and an oz. or two of white vinegar in a glass (simulate the acidity of a stomach, maybe), then I dropped a Centrum in. Here are the results:
1 minute: Small dark green bubbles formed around the outside, this appeared to be the vitamin starting to leak.
2 minutes: Cracks and more bubbles on the surface of the vitamin.
5 minutes: Mostly dissolved with a bit of chunky mass still in the middle.
7 mintues: Completely dissolved, no solid masses left.
I don't know if this proves a damn thing, but in my unqualified opinion, Centrum dissolved fast enough in a glass of water and a little vinegar to give me confidence to continue taking it.
Any comments? Anyone else want to try this and share their results/opinions?