SierraSil is a naturally occurring hydrothermal mineral complex from the Sierra Mountains that has been clinically proven to help support a healthy inflammatory response, gently detoxify and improve physical function. With extensive research in human clinical trials for both safety and efficacy with consistently positive results, SierraSil is the natural choice for proven joint relief. Quality control SierraSil takes pride in our quality standards. Whenever possible, we try to go beyond the requirements. Watch the short videos below to learn more about how our Quality and Regulatory Manager, Caroline Eve, ensures that you get the best quality product every time you purchase SierraSil.