Kristina~ I'll just say this...well, actually I'm quoting Saren from the first post:
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* The United States Pharmacopeia (USP) is the official public standards-setting authority for all prescription and over-the-counter medicines, dietary supplements, and other healthcare products manufactured and sold in the United States. USP sets standards for the quality of these products and works with healthcare providers to help them reach the standards. Therefore, it is important to select a product that specifically lists USP progesterone on the label. Be advised, it has come to our attention that the Rexall brand available at Wal-Mart does not say USP on the label, so be sure to do your own research before you decide whether or not to use that particular brand.
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That being said, I still have over half of a jar of Rexall left, and will probably use the rest of what's in there before I switch to another brand, if I switch. It's your personal choice.