https://www.chancebio.com/products/boldenone-undecylenate-cas-13103-34-9.html casno. : CAS 13103-34-9 Boldenone for sale is a derivative of testosterone that converts to estrogen and causes the body to store water. It has no liver toxicity. However, it can increase appetite, has a strong protein synthesis ability, improve pumping and vascular definition during training, improve muscle mass and enhance muscle endurance. Suitable for beginners, also suitable for use in the muscle building phase or fat loss phaseAll Rights Reserved