Mythreeson...

You can find the ketone test strips at any pharmacy and many large grocery chains also carry them. The price varies depending on where you purchase them, but they run between $6.00 and $15.00 per bottle. You do not need a prescription to purchase them in the United States. Ketone testing strips are not always a reliable indicator of whether or not you are in ketosis; some people use all they ketones produced as energy and therefore don't excrete them in their urine, others don't produce enough ketones to be measured on the strips. If you are consuming 20 grams of carb per day and have been for more than 3 days, you ARE in ketosis whether the strips are telling you so or not. Also...don't shoot for dark purple on the strips. Faint pink means you are in ketosis, dark purple usually means that you are not drinking enough water and could be dehydrated. Some people do show dark purple even when they are drinking enough water, but don't deliberately try to get that color on the strips. What I like to use is something Nat likes to refer to is the "pant-o-meter"...are your clothes fitting looser? If they are, it's working.