You mean known for its branding. Most people have never heard of creapure and those who do haven't tested it for purity.
https://pmc.ncbi.nlm.nih.gov/articles/PMC9761713/
https://pubmed.ncbi.nlm.nih.gov/35268011/
https://pmc.ncbi.nlm.nih.gov/articles/PMC9761713/
https://pubmed.ncbi.nlm.nih.gov/35268011/