Kapha types do generally well with bitter taste, as in green leafy vegetables, but not with sour taste as in fermented foods, yoghurt, kefirs. Bitter, astringent (cranberry, beans, etc)and pungent (spices) are the best options to remove congestion with regard to food. They don't do well with cold things, which juices are, developing phlegm. You may want to check it out for a few days and see how you fare. The large amount of antibodies contained in raw green juices are better tolerated by Kapha types than by the Pitta and Vata types. But be vigilant when the body develops gas/bloating, a sign that you have a reached the point where the immune system gets tired removing these antibodies. Kefirs may have temporary benefits for up to 8-10 days, but then may actually affect the bacteria balance negatively. Every body type or person responds differently. So you may wish to try it and see if it good for you. You could also muscle test it. If mucus is formed or your tongue becomes coated white after 2-3 days of taking it, discontinue. This would indicate that kefir isn't doing you any good.