Supplements like creatine should have a third party sports certification like NSF for Sport, which ensures the product contains no banned substances.

Klean Athlete’s B complex stands out as a strong choice for athletes because it’s NSF Certified for Sport — a certification that ensures products are free of more than 280 substances banned ...

NSF certified, CGMP compliant facilities manufacture ... creatine but got burned out on powder mixes for each and every sports supplement need. Registered dietitian Kelli McGrane notes it ...