Most supplement brands test their first production run and never test again. We test every lot. Before a single bottle of any American Premium Vitamins formula is released, a sample is pulled from the batch and sent to an independent laboratory in the United States. That laboratory confirms the identity of each active ingredient, verifies the potency printed on the Supplement Facts panel, and screens for heavy metals and microbiological contamination. Nothing is released on a raw material supplier's certificate alone, because that certificate describes the ingredient shipped to us, not the capsule that reaches you. Choose a formula below to see exactly what is tested in it and how each result should be read.