Examples of protein shakes for diabetics include Glucerna SR, Homemade Vanilla and Boost Glucose Control, according to Everyday Health. The suggested serving size for both of these shakes is 8 ounces.
Glucerna SR is free of gluten and a good option for those who are lactose intolerant. There are four flavor options, as of 2015: rich chocolate, homemade vanilla, butter pecan and creamy strawberry. The carbohydrate content makes a serving of this shake equal to a small meal or a moderate snack, reports Everyday Health.
The Boost Glucose Control shakes are specifically for people with Type 2 diabetes. This shake is a meal replacement and is also gluten- and lactose-free, according to Everyday Health.