The Peptide Index — Compare 203+ Peptide Vendors
Side-by-side pricing, COA testing standards, payment methods, and community reviews for research peptide suppliers. The PCPartPicker for peptides.
Top-Rated Vendors
View all →Limitless Life Nootropics (Limitless Biotech)
USA · Est. 2019
Limitless Life Nootropics (now Limitless Biotech) is a well-regarded US-based vendor with over 90 research peptides manufactured under GMP protocols. They emphasize quality with HPLC, LC-MS testing, sterility screening, and COAs for every order. Highly recommended in Reddit peptide communities for quality and reliability.
Biotech Peptides
USA · Est. 2017
Biotech Peptides is a highly-rated US vendor with 88+ peptides synthesized and lyophilized domestically. They use HPLC and mass spectrometry for quality control, offer same-day shipping, and provide a 30-day money back guarantee. Product ratings average 4.8+ stars across their catalog, making them one of the most trusted options.
Peptide Pros
USA · Est. 2013
Peptide Pros has been operating since 2013 and claims over 15,000 five-star reviews. They offer a comprehensive catalog of USA-made peptides, SARMs, and research chemicals with COAs, free priority shipping over $150, and a 25% member discount. One of the longest-operating vendors in the space.
Paradigm Peptides
USA · Est. 2014
Paradigm Peptides has been operating since 2014, offering pharmaceutical-grade peptides, SARMs, and nootropics. They provide third-party testing and COAs, and are known for educational content on their blog. Generally well-regarded in the community with a solid but not top-tier reputation.
Chemyo
USA · Est. 2016
Chemyo is one of the most respected SARMs vendors in the research chemical community, known for exceptional quality control and transparency. Their peptide offering is very limited (primarily MK-677), but they're included because MK-677 is commonly used alongside peptide protocols. If they expand into peptides, they'd likely be top-tier based on their track record.
Sports Technology Labs
USA · Est. 2019
Sports Technology Labs is a rising US-based vendor that has built a strong reputation for quality SARMs and is expanding into peptides. They emphasize quality control with USP-grade solvents, glass bottles, and accredited third-party testing. Their peptide selection includes popular compounds and convenient stack options. Well-regarded by the Reddit community.
Browse by Category
All peptides →Popular Peptides
BPC-157
HealingBPC-157 is a synthetic peptide consisting of 15 amino acids. It is derived from a protective protein found in gastric juice and has demonstrated remarkable healing and regenerative properties across numerous animal studies.
8 vendors carry this
TB-500
HealingTB-500 is a synthetic version of Thymosin Beta-4, a naturally occurring peptide found in virtually all human and animal cells. It plays a crucial role in building new blood vessels, muscle tissue, and regenerating wounded tissue.
8 vendors carry this
Ipamorelin
GH SecretagogueIpamorelin is a selective growth hormone (GH) secretagogue and ghrelin mimetic. It stimulates the pituitary gland to release growth hormone in a pulsatile pattern that mimics natural GH secretion.
8 vendors carry this
CJC-1295
GH SecretagogueCJC-1295 is a synthetic analogue of growth hormone-releasing hormone (GHRH). It extends the half-life of GHRH from minutes to days, providing sustained GH stimulation.
8 vendors carry this
Semaglutide
MetabolicSemaglutide is a GLP-1 receptor agonist originally developed for type 2 diabetes management. It has gained significant attention for its powerful weight loss effects and metabolic benefits.
3 vendors carry this
Tirzepatide
MetabolicTirzepatide is a novel dual GIP and GLP-1 receptor agonist. Clinical trials have shown superior weight loss results compared to semaglutide, making it one of the most effective metabolic peptides available.
2 vendors carry this
Peptide Buyer Guides
All guides →Best Peptide Vendors
Our ranked, vetted shortlist of the top research peptide suppliers.
Cheapest Peptide Vendors
Lowest verified $/mg pricing across the directory.
US Domestic Vendors
Fast-shipping suppliers that ship from inside the United States.
Vendors With COA
Suppliers that publish third-party certificates of analysis.
Vendors Accepting Crypto
Suppliers that take Bitcoin and other cryptocurrency.
Fastest Shipping
Vendors with the quickest verified delivery times.
Where to Buy Peptides
A practical guide to buying research peptides online safely.
How to Read a COA
Understand purity, mass-spec, and HPLC results on a certificate.
Peptide Cost Per mg
How to compare true price between vendors and vial sizes.
The Peptide Playbook
The comprehensive guide to peptide research protocols, vendor selection, and COA verification. Everything you need to know in one place.
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