My doctor is very pleased that my D3 isn't in the gutter since taking this. These are very well-priced for the quantity and high mg. I have used a strong probiotic by this same company and it worked to curtail my gerd during and after I weaned myself off an acid blocker so I'm relatively impressed by the company thus far. Make sure to have your D3 tested regularly because you shouldn't take more than you need, toxicity from too much D3 can cause serious problems. Mine was so low that this quantity was needed but that could change