Liquid Vitamin D3 50 mcg 1 fl oz by Life Extension

Life Extension uses only premium quality vitamins and other ingredients. Our dedication to excellence insists that our nutritional supplements meet the highest standards and criteria. That is why Life Extension insists on purchasing only the highest quality raw materials from all over the world, primarily from leading US, Japanese and European sources. Life Extension goes one step further by using advanced analytical methods, such as high-performance liquid chromatography and gas chromatography/mass spectrometry, to ensure our products meet label claims for potency and purity. Life Extension tests its raw materials using US Pharmacopeia and other exacting pharmaceutical assay standards. Finally, a Certificate of Analysis guaranteeing every one of our products’ quality, potency, and purity is kept on file and available.