I know some of them do. I'm not sure on the exact carb count. Most likely less than 1g, but guess it depends on how big the pills are and how many you're taking. I used to just save 5 carbs a day for supplements.

I was taking "Nature Made" calcium for instance, and It says
-No Artificial colors
-No Artificial Flavors
-No Preservatives
-No Chemical Solvents, Yeast, Or Gluten

Yet, in the ingredients it says "Corn Starch" (= Carbs!)
Anddd, it smells and tastes like raw pasta. Go figure.