Campaigns GNC Nutritional Supplements – Discount on GNC Total Lean! Mix & Match Campaign Details: GNC Nutritional Supplements – BOGO 50% OFF GNC Total Lean! Mix & Match. Free Shipping On $49+. Exclusion Apply. Select Products Only Campaign Duration: 1sh – 27th September 2017 Coupon Codes: NONE Landing Page Andrew Tay Product Manager and in-house geek.