This is difficult to say; it depends on the reason for ketosis. As long as ketone levels are greater than 0.5 mmol, you’re in ketosis. Many people think that higher ketone levels are better, but this has yet to be established. Some individuals who have been keto-adapted for an extended period may become particularly efficient at using ketones and therefore don’t have a lot of them circulating in the blood. For some health concerns, such as epilepsy and other neurological conditions, higher ketone levels may be beneficial—exogenous ketones or high-dose MCT may be especially helpful in order to accomplish those levels.