I have been using this product for about 5 years and it has helped me to bring up my ferritin count. I did have some trouble with a Black Friday promotion, as the company did not honor a sale price, stating they only had limited supply available at the reduced price, though their advertisement did not state limited supply available or reduced cost only available to first "many" customers. I tried working with customer service and they said they would send me a free bottle for my inconvenience, but I have never received the free bottle. Be wary of promotions and expect to pay the full price.