From a strictly textbook standpoint, there really should be no to very slight noticable effect. Unless your body is deficeint due to not naturally producing enough HA, or you suffer from arthritis specifically rhumatoid, nothing more than placeabo will be experienced. This is not to say it WON'T produce a effective result, just unlikely in most people. The same can be said of chondroitin sulfate; that the body produces all it needs on its own.
If I myself was considering using supplemental HA, i would do so only if i was experiencing pain or discomfort, and not as preventative measure for a problem that doesnt yet exist.
This is my opinion so take it with a grain of salt