fitday.com says:
Nutrition Facts
~
Amount Per 1 cup
Calories~137.2
Calories from Fat 44.1
~
% Daily Value *

Total Fat 4.9g 8%
~~~ Saturated Fat 3.04g 15%
~~~ Polyunsaturated Fat 0.174g ~
~~~ Monounsaturated Fat 1.41g ~
Cholesterol 19.6mg 7%
Sodium 210.7mg 9%
Potassium 441mg 13%
Total Carbohydrate 12.99g 4%
~~~ Dietary Fiber 0g 0%
Protein 10.05g 20%

This site has info on low fat buttermilk"
http://www.parmalat.co.za/ourproducts/bonnita/top.htm
NUTRITIONAL INFORMATION
Per 100ml

Variant----Fat----Protein-----Carbohydrate----Energy
Low fat----1.8g------3.5g------- 5.0g--------215kj

Alsothis link to the legal requirements.