Jigsaw Health is the kind that my husband and I have been taking since June 2007. It was either June or late May of 2007. It's the kind at my blog. I wouldn't do without it. You don't get the diarrhea effect that many magnesium supplements have because it's a sustained release. It stays in your body 8 hours. It's also got malic acid that is attached to it. And a little bit of B6 and Folic Acid.
I meant to be back earlier, but our Internet is down. I'm on dial-up right now as a backup and it's terrible.