We searched and turned up nothing we could guarantee. This is probably because it’s not necessary to purchase vitamin D made in the US if you are looking for a good product. The vast majority of all vitamin D put into supplements comes from China. The vitamin D in the dotFIT formulas are all from China because the supplier has the same or better regulation/testing processes than most US suppliers of raw materials. Additionally when all the raw vitamin D arrives at the dotFIT US manufacturer (Robinson Pharma), which follows strict Good Manufacturing Practices (cGMPs), the vitamin D is all tested AGAIN for purity and potency. Therefore you are doubly assured everything is pure and safe. On another related note, unless your doctor has recommended a different level of vitamin D, you should shoot for 1000ius/day in a multivitamin mineral formula (MVM) rather than taking vitamin D by itself. Vitamins and minerals all work together and the vast majority (if not all) of us fall short of our daily needs of some of the nutrients contained in good MVM. When looking for vitamin D make sure it’s Cholecalciferol (D3). Your dotFIT MVM formulas contain 1000-1200IUs of D3.