Regarding immorality:
Might be interested in this: http://www.popsci.com/science/article/2011-07/man-who-would-stop-time it's somewhat long and dense though, so, fair warning.
Regarding this serum thing? If it didn't provide immortality (and assuming I've already taken it) I'd get it in the hands of major health and charity organizations and then leverage the credit for its invention to reposition myself in life (maybe an award, recognition, college loans paid, a nice job somewhere). I would sell it, but I think it would just be buried then, in the interest of keeping the costs of healthcare high.
If it did provide immorality, then I'd have to reconsider burying it myself. As some have said, I don't think we're ready for immortality on a large scale yet as a species.