Fenny, I am so glad you posted. I was just logging on to ask about the same thing. I started Caltrate 3 days ago (2 per day) and I have had bad gas pains (which I don't usually have) and D for since I started it. My intestines just never feel settled. I don't know if its coincidence either, we both need advice! Someone help us. Sorry we had to be the first to rain on the Caltrate parade.