It must not be for everyone. In the beginning I was fine, then in November I somehow got stuck on the 24 hr rotation. Then when the ban came and was lifted it allows me to take one around the same timeframe. Monday I took one after lunch 12 ish and yesterday I took one at 745am. So I think there's something or a certain time that if you hit it, it puts you into the 24 hr time frame instead of once every 24 hrs???