Unfortunately, in this case, the small letters are the liars. The product clearly is intended to prevent disease (what’s the point of making a medicine to boost the immune system if you don’t want it to stop people from getting sick?) Whether it actually does prevent disease is another question.
It would be interesting to see what would happen if nobody actively campaigned for president, and ballots had nothing but write-in blanks. America would probably elect nothing but actors, singers and football players. Okay, rephrase: it would be interesting and catastrophic.