Cheap shot indeed by GNC if those folks really transmitted this message; anyways their house brand products are so fucking full of fluff I wouldn't touch them with a 10 foot pole.
Second that. I haven't bought from them in years after learning they off load their shit at hefty mark-ups. These days I shop for my supplements online mostly via Nutrifirst - things are cheaper, better, faster.
The marketing person who drafted this ad could have been a wee bit more sensitive, just saying.