Nolva stimulates lh production too. They both are similar in what they do, but clomid does certain things better while nolva does certain things better. Two good points for nolva is blocking receptors at the breast tissue which is why it's for breast cancer patients, and nolvas positive effects on cholesterol. Imo clomid stimulates lh better which is why some doctors use it for trt treatment before administration of test. You can find opinions and studies that show one being better than the other, but both should be used in any pct.