To the individual who takes Tums to build bone density:
I'm assuming you're saying you take them for the calcium content. I suggest taking a calcium supplement instead, because Tums are antacids which decreases the acid in your stomach. In order for your body to efficiently absorb calcium, it needs the stomach acid. So in conclusion: Decreased stomach acid = Decreased calcium absorption = Waste of time and money trying to get your calcium needs from Tums (or any other antacid). While it does say "calcium source" on the bottle, theoretically it is, seeing as if you analyzed it in a lab, there would be a calcium content. However, things work much differently in the body, which is why correctly taking supplements in pill form can be a tricky thing. I have a degree in Nutritional Science, and I find it has been extremely beneficial in regards to actually being able to ensure I'm absorbing all these 'extras' I'm ingesting. Taking boat loads of supplements is pointless if your body isn't even absorbing them!