Muscle Builder* - Some "experts" make bold claims that it builds muscle. They compare it to synthetic anabolics that give many athletes who dope an advantage over the competition. This is folly claim that has no backing from direct research or research into other associated fields that would be relevant to deer antler spray. Only one thing will build muscle: proper resistance training. Make the right choice and get to work.*
A systemic review on human interventions makes note of a study conducted on patients of osteoarthritis (Edelman et al. 2000; cannot be located online) which found improvements in joint pain symptoms relative to baseline in the Velvet Antler group and not placebo, although a lack of information on blinding and randomization precludes results that can be drawn from this study.