IANAL, but at a minimum, it's likely they should include the standard supplement disclaimer of "This product is not intended to cure, prevent, or treat any disease" [1]. This protects them from liability depending on how the FDA decides to classify the product.

Regardless of legality, they are making some very bold claims that would benefit from some scientific study. Preferably, expert, peer-reviewed, published scientific study.

[1] http://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRs...