The short answer is it’s up to you. But here’s our take: Heavy cream or heavy whipping cream (HWC) is recommended over whipping cream, and whipping cream is recommended over half-and-half. This is because half-and-half has a lower fat content and higher sugar content than HWC, meaning you likely will not achieve or maintain ketosis. (Whipping cream falls somewhere in between the two.) If you’ve been reading your nutrition panels, you may have noticed they will generally show that all of the creams have less than a gram of carbs per serving—even though the half-and-half has nearly 4x as many carbs per calorie compared to heavy cream. If you want to get into the nitty gritty, take a look at the USDA food database.