got mine from kilo...started at 900mg/day....nothing but headaches and cramps...so i drank more water....still had headaches....still had cramps....up to 3gms/a day and no headaches, no cramps, good energy supply thru the day...buddy of mine got his from beyond-a-century and had the same thing, headaches, crampiness...up'd his amount and no problems....also check your fiber intake...make sure you got good #2's coming out...