(Mon, 03 May 2010 19:47:06 +0000)EsterilSol™ is a Zinc Gluconate with L-Arginine compound that sterilizes the animals with just one injection in each testicle. The effects are permanent and reliable. And, most importantly, virtually painless. Castration, on the other hand, involves surgically removing the testicles, which can cause a host of related issues, pain being one of the many. 