Try the vinegar, you might be surprised......
Actually a while ago we had a big debate about this at work, a bunch of us brought in all kinds of multis, pills, c, b, etc and a big bottle of vinegar. We pretty much did the test as described below, and it was eye opening, I dont recall all the brands, but there were quite a few that did not dissolve at all, we tracked it 15min, 30min, 45min, 1hr, and the ones that didnt dissolve we left sitting in the vinegar all day and a couple didnt dissolve the WHOLE day. And to make matters worse, I have heard that many many undigested pills are found by the guys who work on septic tanks, might be rumor, but Ive heard it numerous times
There are a ton of links about this supposed quasi-scientific way to see how your pills break down, I dont verify any of the webistes credentials, but it seems the vinegar is prettymuch the accepted method.
Multi-vitamins and minerals
qoute-
"...Does your multi-vitamin dissolve properly?
Some manufacturers claim that many brands of vitamin tablets are so hard that they go through the body undissolved, and quote nurses who find vitamin pills in the bedpans of their patients. While this can happen, here's a simple "acid test" you can apply to find out if your multi—or any other pill!—dissolves properly:
1. Place approximately one cup of white vinegar in a small bowl and warm it to 98 degrees or so by placing it inside a larger bowl of water that you "top up" several times with warm water from the tap. (The goal is to keep the vinegar reasonably close to 98 degrees for half an hour.)
2. Drop your multi-vitamin (or other pill) into the vinegar, and jostle it about every five minutes or so by gently shaking or swirling the cup. While you can also stir the mix with a wooden stick or toothpick, be careful not to touch the tablet itself.
3. The tablet should dissolve within 30 minutes. (This is the USP standard for all pharmaceutical tablets.)
If it doesn't dissolve within a full hour, it's not doing you much good. Get another brand!......."
Health Tidbits
USA WEEKEND Magazine
http://www.unitedmedicalnetwork.com/researchdocs/Why Take UMN Physicians Daily Multiple.doc