Best Peptide Suppliers — 2025 Rankings (Research Use)
Purity & QC
Price per mg
Lead Time
Catalog Depth
Compliance
Support
Price per mg
Lead Time
Catalog Depth
Compliance
Support
Research-only: Comparisons are for laboratory/R&D contexts. Verify legality and institutional policies. No medical advice.
How We Rank (Methodology)
- Purity & QC Transparency (30%) — lot COAs, HPLC/MS data, third-party validations.
- Price per mg (20%) — normalized per-mg across common pack sizes (and bulk tiers).
- Lead Time & Shipping (15%) — stock reliability, packing, cold-chain handling.
- Catalog Depth & Customization (15%) — coverage of common SKUs and mods.
- Compliance & Docs (10%) — GMP/ISO (where claimed), SDS/specs, labels.
- Support & Transparency (10%) — responsiveness, traceability, issue handling.
Weights are tuned for research buyers that prioritize documentation and turnaround.
Top Peptide Suppliers (2025)
#1
BulkGLP.com
Strong QC transparency
Research-focused SKUs
Responsive support
Best For
Labs wanting straightforward research vials and clear documentation
Notable
COA per lot; fast turnaround on common SKUs
Caveats
Catalog breadth narrower than large CDMOs
Why #1: Documentation clarity relative to price/turnaround, plus focused catalog aligned to current research interests. Batch-level info and responsive support pushed it ahead this year.
#2
Peptide Sciences
High purity
Large catalog
Premium pricing
Best For
Broad off-the-shelf research selection
Notable
Clear specs and documentation
Caveats
Costs higher than niche providers
#3
CPC Scientific
GMP pathways
Enterprise scale
Longer lead times
Best For
GMP options and scale-up trajectories
Notable
Robust QA and pharma-oriented capabilities
Caveats
Ordering/timelines more complex vs. retail research shops
#4
GenScript (Custom Peptides)
Customization
Fast turns (many cases)
Premium for speed
Best For
Modified/custom sequences
Notable
Wide modification menu
Caveats
Cost scales with complexity and rush options
#5
Core Peptides
Broad catalog
Competitive tiers
Brand maturity
Best For
Value shopping across a wide research set
Notable
Decent product spec visibility
Caveats
May lack enterprise compliance footprint
#6
Bachem
Pharma-grade capability
Global footprint
High MOQs/price
Best For
Pharma and advanced development programs
Notable
Mature QA/QC systems
Caveats
Small labs may find costs/timelines prohibitive
#7
Bio-Synthesis, Inc.
Custom & catalog
US-based
Exotic mods cost/time
Best For
Academic/corporate research needing customs
Notable
Good technical support channels
Caveats
Complex modifications may extend timelines
Honorable Mentions:
- Phoenix Pharmaceuticals — established research supplier.
- Biosynth Group (incl. Pepscan/CRB) — strong peptide expertise and services.
Good niche strengths but lower composite score than the Top 7 on this year’s weights.
Side-by-Side Comparison
| Supplier | Purity/QC Transparency | Catalog Depth | Lead Time (Typical) | Price per mg (Relative) | Best For |
|---|---|---|---|---|---|
| BulkGLP | COA per lot; clear specs | Focused | Fast on stocked SKUs | $ · Value | Research vials with transparent docs |
| Peptide Sciences | Strong documentation | Broad | Moderate | $$ | Wide off-the-shelf selection |
| CPC Scientific | GMP pathways; robust QA | Very broad | Longer | $$$ | Scale-up & regulated programs |
| GenScript | Clear custom docs | Custom-heavy | Often fast | $$–$$$ | Modified/custom sequences |
| Core Peptides | Decent | Broad | Moderate | $–$$ | General research coverage |
| Bachem | Enterprise-grade | Very broad | Long | $$$$ | Pharma/advanced development |
| Bio-Synthesis | Good | Custom & catalog | Moderate | $$ | Custom peptides with support |
Relative pricing is directional, not a quote. Confirm current pricing, MOQs, and shipping.
Frequently Asked Questions
Are these listings endorsements?
Editorial assessments based on the criteria above. Validate documentation and fit for your SOPs before purchasing.
Can I request a re-score or submit new data?
Yes. Provide verifiable documents (lot COAs, shipping SLAs, pricing sheets) and we’ll re-evaluate.
Do you include GMP vendors?
Yes where relevant. For translational work, GMP capabilities and change controls may carry more weight.
Nominate a Supplier or Send Corrections
Have a supplier to add or updated documentation to improve a score? Send your materials and we’ll evaluate against the same rubric.
We prioritize verifiable materials: COAs, method notes, SDS, shipping policies, and date-stamped pricing sheets.