If you are in need of supplements, it's time to stock up at GNC. All of the three offers can stack.
40% off sitewide coupon code:
Spend $100 or more and get $30 off:
Spend $100 and get $40 GNC cash to use from December 29, 2019 to January 13, 2020:
No coupon needed. Just need to spend $100 or more after applying both coupons above. So in essence, if my math is correct this allows you to buy about $236 worth of goods at GNC overtime for about $100.
Note: I just ordered and I could tell you that all of the offers stacked and worked for me. Hope it works for you, too!