When supplementing with Life Extension products, please rest assured that you are taking the highest-quality products. In fact, Life Extension's quality control and quality assurance measures are regarded as the most stringent and advanced in the industry. Please note that we use raw materials that have scientific validation for dosage, safety, and effectiveness.

Yes -- they've been in this business for more than thirty years, and they've done so much research and development- it sure looks like they know what they are talking about!

I did read up on their website- all their products are GMP certified and there was something about best dosages being decided according to scientific study. I believe they are very thorough in such research.