Yes, it is quite possible that the red yeast rice brand to which you switched contained little or no lovastatin. As shown in our Red Yeast Rice Supplements Review
, even though products may list the exact same amount of red yeast rice per pill (typically 600 mg), those pills may contain less than 0.1 mg or more than 10 mg of lovastatin compounds, depending on the brand. That's more than a 100X difference and this will have a big impact in terms of efficacy.
You can compare the amounts of lovastatin compounds which we found in different brands, and learn more about using red yeast rice, in our Red Yeast Rice Supplements Review >>
We will consider purchasing and testing the brand you took (name removed above) in a future review.
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This CL Answer initially posted on 1/30/2016.
Last updated 8/2/2017.