Here's some info for those that might not know what it is (i know i didnt):
From Wikipedia:
Cissus quadrangularis has been evaluated for medical uses. As of May 2009, a PubMed search for Cissus returns 68 results.
As a rich source of carotenoids, triterpenoids and ascorbic acid it has potential for medical effects, including "gastroprotective activity" in conjunction with NSAID therapy[2] and in "lipid metabolism and oxidative stress" [3].
Cissus has been "discovered" by sports and nutritional supplement manufacturers and, mostly based on anecdotal evidence, many claims for "weight loss" and "muscle protective" effects are being made. Participants in some weightlifting forums also say it can help with soft tissue problems in the joints such as tendonitis.
Cissus is known to be an ancient medicinal plant, with optimal healing in white tissue areas of the body (tendons, ligaments, etc).[4]
Sport supplement manufactures recently purified an extract of the plant to help increase the delivery of nutrients to soft tissue. There have been claims that it helps heal fractures by increases in new bone growth, and has been shown to relieve arthritis and osteoarthritis when used topically as a balm.[4]