i stumbled across this by accident. if i take a p&b shake once a day for the 5 days or so prior to my period i get no cramps!!!! for the second month i've successfully used this technique to prevent cramping and that constipated feeling.
i'd just finished a Bowel Cleanse and it happened to fall on the first day of my period. my period came on very easy and i had no pain, discomfort, or cramping. i've done it both times since and i've had easier periods than i've had since i was a kid.