Mixing wheatgrass juice with pineapple would be interesting.I personaly dont mix my wheat or barly with anything.Because mixing tends to spread out the nasty taste.Juicing with a blender is a misnomer.You can make some geat smoothies,Ilove my vitamix 5000.You should try barley grass,not so bad of an aftertaste.For the constapation take some vitmin c and lots of water.