So to answer your question, I think both blood ketone measurements. If you're just starting the ketogenic diet, it may be good to just use urine to say yes you're in ketosis, you're not. It's like semi-quantitative. And then spend the money to get a ketone meter. Like the Keto-Mojo device is probably one of the best, and then a breath acetone meter is good for people who are doing fasting and for people that are really interested in like weight loss.