We ensure our manufacturers follow the current good manufacturing practice (cGMP) guidelines and thoroughly test Balancing Oil prior to selling it. We ensure it contains at least 2,500 mg of natural progesterone per bottle. We also test to ensure it does not contain microbes (such as yeast, mold, E. coli, salmonella or staphylococcus) or heavy metals (such as arsenic, cadmium, lead, or mercury).