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> "creapure", which is a patented formula known for its purity

You mean known for its branding. Most people have never heard of creapure and those who do haven't tested it for purity.

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There are several studies of Creapure and other brands. Most of the studies done on CM use the Creapure brand.

https://pmc.ncbi.nlm.nih.gov/articles/PMC9761713/

https://pubmed.ncbi.nlm.nih.gov/35268011/