Euricoma Longfolia: A shrub found in Southeast Asia that is said by some native cultures to enhance male virility. It has been used unofficially to treat fever, high blood pressure, bone pain, and syphilis, and the limited clinical data about euricoma longfolia that exists suggests it may possibly increase testosterone levels. There is no data about the long-term effects of euricoma longfolia consumption.
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.