GNC has many supplements, however, they seem to lack the freedom to sell what all is available and best for the consumer.  Many more natural and organic products are sometimes inexpensive and can not be patented into a blend the dominant Drug companies can sell.  Hence, the corruption involved in what makes it to market here in the US.  Until we keep demanding, loudly, as one, that we want everything that is cheap and good for us, it won't happen.