Not All Vitamins Are Created Equal: Why Your Supplements Might Be Failing You

4. Third-Party Testing Certification
The supplement industry is not as strictly regulated as pharmaceuticals. To ensure that what is inside the capsule is exactly what is written on the label, look for the logos of independent inspection bodies. Certifications from organizations such as USP (U.S. Pharmacopeia), NSF, or Informed-Choice indicate that the product has been tested for purity and dosage accuracy and is free of toxic contaminants or heavy metals.