Thorne's creatine uses Creapure — the gold-standard German-manufactured creatine monohydrate with the highest purity specification in the industry (99.9%+ creatine monohydrate, tested for heavy metals, banned substances, and microbial contaminants). NSF Certified for Sport means it's tested by an independent third party — the certification required for professional athletes and used by major league sports organizations. Dissolves cleanly with no residue and no noticeable flavor. The benchmark all other creatines are compared against.