Use code PEPDEALS for 40% off everything at Modern Research Peptides (MRP). The October Sale ends Monday, October 19, 2026 at 11:59 PM Eastern.

MRP is offering its biggest discount of the fall. PEPDEALS gives you the same 40% savings advertised in the October promotion, across the entire store. Enter PEPDEALS at checkout; one code is allowed per order. Free Hospira on orders over $275 is available as a checkout reward; choose it from your unlocked rewards.

How to get 40% off at MRP

Shop Modern Research Peptides →, add your research supplies, and use code PEPDEALS at checkout for 40% off. This is the total coupon discount, not an additional discount stacked with OCTOBER.

Sale deadline: October 19 at 11:59 PM ET. A $100 merchandise subtotal becomes $60 before shipping and taxes.

See the MRP vendor page for testing and shipping information, or browse current research vendor sales.