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For each product we hold the manufacturer's lab report on one of its production lots. What a report covers varies: some measure the main ingredient, many test only for heavy metals and microbes. The lab reports page shows what was measured for each product and what was not.

No. Our products are not certified by NSF, USP or Informed Sport. If you compete in a tested sport, choose a product that carries one of those certifications.

By a contract manufacturer. It lists the United States as the country of manufacture for most of the line and states that its facilities are certified for good manufacturing practice. Ingredients are domestic and imported.

Often, yes. Each product page has a section on combining it with others, including where two products contain the same ingredient. If you take medication or have a medical condition, ask your doctor first.