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-Cut the peels into thin strips and lay them out on cheesecloth, or use a dehydrator to dry out the peels. After a few days, or when fully dry, put the dried peels into a coffee grinder to make into a powder. One spoonfull is said to be all you need for a whole day. Add the powder to your food or drinks, store in an airtight container.
You can use organic grapefruit, tangerines, oranges, lemons or limes. :-)