If you have been considering purchasing Cellucor’s new P6 Black Extreme, but are finding the retail price a little too much for your credit card to take. There is a code floating around that may be exactly what you are looking for. Previously Cellucor ran a promotion to measure ones viral reach through their Facebook account by sharing a certain link, and then rewarding the popular sharers with a discount to match. For those of you who used the social network app and only got 10 or 20%, not making the $90 GNC price any better. Fortunately the vouchers were never designed for individuals, meaning they can be used more than once. The particular coupon we have has been tested and is currently functioning, but we can not confirm for how long. Either way head over to GNC now, add P6 Black Extreme to your cart, and enter the code ‘21397‘ for 50% off, as well as for a limited time free shipping.