I have been using NatureDay liquid for 30 days and have seen, and felt, great improvement. I originally measured 38in. across my chest and now measure 40 in. This alone is more than I was expecting after just 30 days. I am very happy with the results and am very interested in continuing to use NatureDay products. I was also very happy that there were no negative side effects and I even noticed an increase in my libido instead of a drop that I was expecting. Overall I would definitely recommend this product.