'sic' is used to indicate that a mistake was made in the original quote, but is being reproduced without correction.
"Research scientists and technicians at General Nutrition Labs, ... went to work to harness all of the vegetables and combined all of them into a natural, easy to take potent tablet. The result is Health Greens (sic) , a new potent breakthrough in nutrition ..."
What does "sic" mean here?
Not necessarily a mistake, but usually a word or phrase that the quoter considers a mistake or that the reader might consider one.
Sic: intentionally so written -- used after a printed word or passage to indicate that it is intended exactly as printed or to indicate that it exactly reproduces an original