TweetOptimum is pretty low carb considering other powders. I dont thikn 4-5 carbs will kill you. I have been taking Optimum's 100% whey with a 1/2 cup of crushed oatmeal as my carb source. If Im in a hurry, Ill have Optimum's 100% whey with 25g of malto and 25g of dextrose.