It’s ok to start slow with just 2 shakes a day but I believe that taking at least 4 shakes is very desirable. Personally I go on a juice fast and take 5 shakes a day. This, for me, is very constipating so I take a daily cleansing enema.
One teaspoon of castor oil is a small dose and would it make you have more bowel movements? With PB shakes I believe that one needs to take some kind of laxative or enemas to move your bowels several times a day. Also you need to drink a lot of water.
Please read my blog titled “My challenge”, link below.