“These are so much more gentle on my stomach than the powdered Exogenous ketones. I've had zero side effects. I take them in the morning with my coffee and don't have any issues with caffeine jitters. I have been taking them for about a week now but I'm not sure if they are working. When I test my ketone levels later in the day, it says I am "negative" even after sticking to a keto diet all day. I'm not sure if these capsules are supposed to work like the powders or if it has to build up in your system. After consuming the powdered exogenous ketones, my ketone levels were very high even hours after consuming. However, I like that the capsules are flavor-free, more convenient, and gentle on my stomach. I will continue to take them to see if my ketone levels increase.”