Soy protein doesn't have a great reputation in the performance world. Unfortunately, there is not a great deal of research specifically looking at soy protein to enhance recovery. However, there is some to suggest the isoflavones and saponins found in soy protein have anti-inflammatory and anti-oxidative properties, giving it great potential to enhance recovery.
There are quite a few supplements which claim to reduce muscle damage; creatine is one of them. The implications of this claim is quicker recovery, reduced soreness, and increased performance gains. There has been plenty of research conducted on whether or not creatine supplementation reduces muscle damage.
We've all felt the results of the first day at the gym: soreness, stiffness, inflammation, and pain. The cause of this discomfort is known as exercise induced muscle damage (EIMD), and although it's uncomfortable, is a necessary part of growth.