Andreas Harttmann
I run Peptides Promo Codes (peptidespromocodes.com), a directory of research-peptide suppliers and the discount codes that work at their checkouts, and I write the guides on its research blog.
I test discount codes at checkout, and each listing shows the date it was last checked. When I decide which suppliers to list, I look for published third-party certificates of analysis rather than a purity claim on a product page.
Some store links and discount codes on this site are referral links and codes, and we earn a commission when they are used. Rankings are never for sale, and paid placements do not affect inclusion or order.
Nothing I publish is medical advice. All products referenced on this site are for laboratory research use only, not for human or veterinary use.
How I check codes and suppliers
- Codes are tested at checkout. I try each code in a real cart before it is listed, and the listing shows the date of the last check. Codes are re-checked weekly, and a code that stops working comes down.
- Suppliers need third-party lab reports. I look for certificates of analysis that name the testing lab, the method, the batch and the date. A purity figure with no report behind it does not count. The full method is in the Buyer's Guide.
- Policies and ordering. I check that shipping, returns and research-use policies are published in plain sight, and look at shipping destinations, accepted payment methods and how responsive support is.
- Listings are monitored. Listings are re-checked on a rolling schedule, and a vendor that slips below the standard comes down, regardless of what the listing earns.
- Corrections. Spotted an expired code or an error? Email info@peptidespromocodes.com and I will re-check and update the listing.
Articles by Andreas Harttmann
- SheMed Discount Code 2026: 20% Off Your First Payment with Code "PEP"
Promo Codes ·
Use SheMed discount code PEP for 20% off your first payment. Our guide covers SheMed's plan prices, who is eligible, how the consultation and blood test work, delivery and cancellation.
- HelloStacks Coupon & Discount Code 2026: 20% Off with Code "PEPTIDESPC"
Promo Codes ·
Use HelloStacks coupon code PEPTIDESPC for 20% off research peptides. Our review covers its Vanguard Laboratory certificates, prices, quantity breaks, shipping and payment.
- Peptime Discount & Coupon Codes 2026: 10% Off with Code "PPTXKW10"
Promo Codes ·
Use Peptime discount code PPTXKW10 for 10% off US-compounded research peptides. Our review covers its lab reports, prices, volume pricing, USPS shipping and payment options.
- Peptides Promo Codes & Coupons October 2026
Promo Codes ·
Every peptide promo code and coupon in our directory for October 2026, in one place. Up to 30% off at 12 suppliers, with the date we last checked each code and links to every store.
- Drexa Labs Promo Code 2026: 15% Off with Code "PEPTIDESPROM15"
Promo Codes ·
Use Drexa Labs promo code PEPTIDESPROM15 for 15% off research peptides, on top of the store's volume pricing. Tested at checkout, with our review of its ILS lab reports, prices and shipping.
- Retatrutide: Phase 3 Results, Side Effects and FDA Status (2026)
Research ·
Retatrutide is Eli Lilly's experimental triple agonist, and the strongest weight loss drug tested so far. Here are the phase 3 TRIUMPH results, side effects, how it compares with tirzepatide, when it could be approved, and what research-grade "reta" really is.
- Tesamorelin: What It Does, Trial Results, Side Effects and FDA Status
Research ·
Tesamorelin (Egrifta) cuts deep belly fat but does not cause weight loss, and it is FDA-approved only for HIV-related lipodystrophy. Here is what the trials show, what happens when you stop, its side effects, and how research-grade tesamorelin compares.
- Arizen BioLabs Discount Code 2026: 30% Off with Promo Code "FALL30"
Promo Codes ·
Use Arizen BioLabs promo code FALL30 for 30% off sitewide during the fall sale, or backup code QUICK for 10% off. Both codes checked on September 26, 2026.
- Mounjaro vs Wegovy: What the Head-to-Head Trial Shows
Research ·
Mounjaro (tirzepatide) and Wegovy (semaglutide) are the two main weight loss injections in the UK. Here is how they differ, what the first head-to-head trial found, and the safety points to know before you start.
- Best Peptides for Weight Loss in 2026, Ranked by Evidence
Research ·
The best peptides for weight loss, ranked by the strength of their human evidence. FDA-approved tirzepatide and semaglutide lead, retatrutide and CagriSema are in late-stage trials, and popular research peptides like AOD-9604 and MOTS-C have little or no human data. Plus verified vendors and discount codes for research-grade peptides.
- Alera Research Promo Code 2026: Up to 12% Off in Bulk, No Coupon Code Needed
Promo Codes ·
Looking for an Alera Research promo code or coupon code? You do not need one. Bulk pricing takes 6% to 12% off each vial of a product automatically, on top of the sitewide sale price.
- PS Peptides Review and Discount Code 2026: 10% Off with Promo Code "NOW10OFF"
Promo Codes ·
Our PS Peptides (PSPeptides) review covers its lab reports, prices, shipping and payment options, plus promo code NOW10OFF for 10% off on top of multi-vial pricing, tested at checkout.
- Bacteriostatic Water for Peptides: Expiry, Storage and Spotting Fakes
Guides ·
Bacteriostatic water is sterile water with 0.9% benzyl alcohol, made for multi-dose vials. Here is how it compares with sterile water and saline, when it expires, and how to check that a vial is genuine.
- GHK-Cu: What the Copper Peptide Research Shows and What It Doesn't
Research ·
GHK-Cu is a small copper-binding peptide first found in human blood plasma. Here is what lab, animal and small skin studies show, where the evidence stops, and the safety questions researchers still ask.
- How to Read a Peptide COA: Purity, Identity, Net Content and Endotoxin
Guides ·
A peptide certificate of analysis packs identity, purity, quantity and endotoxin results onto one page. Here is what each line means, what it leaves out, and how to spot a report you should not trust.
- PepKits Discount Code 2026: 10% Off Research Peptides with "peptidespromocodes-com10"
Promo Codes ·
Use PepKits discount code peptidespromocodes-com10, or the backup promo code acole198310, to take 10% off full-price research peptides at pepkits.is. We tested both codes at checkout on September 24, 2026.
- Peptide Confidential Promo Codes 2026: 10% Off, Up to 30% Off by Quantity
Promo Codes ·
Looking for Peptide Confidential promo codes or a coupon code? You do not need one. You get 10% off your order, and quantity savings take 10% to 30% off each vial automatically at checkout.
- Peptide Won't Dissolve? Fixes for Cloudy, Gelled and Clumped Vials
Guides ·
A peptide that won't dissolve, turns cloudy or sets into a gel usually has a solubility or handling problem. Here are the likely causes, the gentle fixes, when to discard a vial and how to store it.
- Peptide Scams: Red Flags, a Vendor Checklist and What to Do Next
Guides ·
Most peptide scams follow a few patterns, from strangers offering a "trusted source" to fees that appear after you pay. Learn the red flags, check a vendor step by step, and know what to do if you get caught.
- Peptide Testing Lab Guide: What to Test and How to Send a Sample
Guides ·
A vendor's certificate covers a batch, not the vial you hold. Here is what a peptide testing lab can check, which tests to run first, how sending a sample works, and how to judge the lab.
- Peptide Units to mg: How to Convert Syringe Units Into mg and mcg
Guides ·
A syringe unit measures liquid, not peptide. Learn how to convert peptide units to mg and mcg with one concentration formula, clear worked examples and a free calculator.
- 99 Purity Peptides Discount Code 2026: Save 10% Sitewide with Promo Code "PPEPTIDESPC10"
Promo Codes ·
Use the active 99 Purity Peptides promo code PPEPTIDESPC10 for 10% off your entire order. It applies store-wide with no minimum purchase, on a single vial or a bulk restock.
- American Peptides Discount Code 2026: Save 10% Sitewide with Coupon Code "ABRAR10"
Promo Codes ·
Use the verified American Peptides coupon code ABRAR10 for 10% off your entire order. It works sitewide with no minimum purchase, on a single item or a full restock.
- Healius Peptides Discount Code 2026: 10% Off with Referral Code "abrar10"
Promo Codes ·
Save 10% on your entire purchase at Healius Peptides with promo code abrar10, or shop straight through the referral link. Storewide, with no minimum spend.
- Peptide Bonds: How Amino Acids Link Into Peptides and Proteins
Science ·
A peptide bond is the covalent link that joins one amino acid to the next, formed when a carboxyl group meets an amino group and a water molecule is released. Here is how that bond forms, why it is rigid and planar, and what finally breaks it.
- Peptide Synthesis: How Research Peptides Are Built and Verified
Science ·
Peptide synthesis lets researchers build defined amino acid sequences to order. This guide covers the chemistry of coupling and protection, solid-phase methods, verification by HPLC and mass spectrometry, and how synthetic peptides are used in the lab.
- Peptides vs Proteins: The Difference Explained
Science ·
Peptides and proteins are both amino acid chains joined by peptide bonds, yet they differ in size, folding, stability, and how they are made. Here is a clear breakdown of where the line falls and why it matters in research.
- Research Peptides 101: What They Are and How Labs Use Them
Research ·
Research peptides are short amino acid chains made for laboratory work, not for people. Here is what they are, how the field developed, where scientists use them, and the purity and storage problems every lab has to solve.
- Peptides: What They Are, Potential Benefits, and Safety Concerns
Research ·
Peptides have moved from niche biochemistry into mainstream skincare, weight management, and recovery. Here is what they actually are, which benefits the science points to, and where the real safety risks sit.