Strontium (citrate) is an alkali earth metal, very similar in structure to calcium, and has a similar effect in the body.
Vital Nutrients uses the highest standards for Quality Assurance. Vital Nutrients has been audited and is certified for Good Manufacturing Practices (cGMP) by the NNFA (National Nutritional Foods Association). Their facilities are audited by these independent outside agencies to third party certify and prove their compliance with GMP guidelines and quality assurance practices. These two organizations are leaders in natural product manufacturing quality assurance certification in North America.