Best Peptide Companies [2026]: 8 Trusted Vendors Reviewed
We spent 200+ hours testing peptide vendors on purity, pricing, transparency, and shipping. Here are the 8 that actually passed.
Third-Party Lab Verified
Updated Feb 2026
The research peptide market has exploded over the last few years – and so has the number of vendors selling underdosed, impure, or outright fake products. Independent testing has found that some vendors sell peptides with purity levels below 80%, meaning you’re paying full price for degraded compounds mixed with synthesis byproducts.
We spent over 200 hours evaluating peptide companies, verifying certificates of analysis, cross-referencing third-party lab results, and placing test orders. The result is this list of 8 vendors that consistently deliver legitimate, high-purity research peptides.
If you just want the short answer: Core Peptides is our top pick for most buyers. They combine verified 98%+ purity, competitive pricing, and fast shipping. But depending on your priorities – budget, selection, transparency – a different vendor on this list might be the better fit.
Table of Contents
- How We Evaluate Peptide Companies
- Quick Comparison Table
- Core Peptides – Best Overall
- Limitless Biotech – Best Quality
- SwissChems – Best Selection
- BioLongevity Labs – Most Transparent
- Raw Amino – Best Value
- Paradigm Peptides – Best for Beginners
- Amino Asylum – Budget Pick
- PureRawz – Runner Up
- How to Spot Fake Peptide Vendors
- Frequently Asked Questions
How We Evaluate Peptide Companies
Every vendor on this list was scored across five weighted categories – the same methodology described on our About page:
1. Purity and Testing (30%)
This is the most heavily weighted factor. We verify that vendors publish Certificates of Analysis (COAs) from recognized third-party labs – not in-house testing. The labs we trust most include Janoshik Analytical, MZ Biolabs, and Colmaric Analyticals. Testing methods should include HPLC (High-Performance Liquid Chromatography) for purity and Mass Spectrometry for identity confirmation.
2. Transparency (25%)
How openly does the vendor share testing data, business information, and sourcing details? We look for publicly available COAs, clear lab identification, honest product descriptions, and accessible business registration. Vendors who make you request COAs or hide testing details score lower.
3. Pricing and Value (20%)
We compare price-per-milligram across vendors for the same peptides. The cheapest option isn’t always the best, but you shouldn’t be overpaying either. We flag vendors with suspiciously low prices (often a sign of underdosed products) and those with unjustified premiums.
4. Shipping and Fulfillment (15%)
Average delivery times, packaging quality (cold chain for sensitive peptides), tracking availability, and international shipping options. Peptides are sensitive to heat and light, so proper insulated packaging with cold packs matters.
5. Customer Experience (10%)
Website usability, customer support responsiveness, return/refund policies, and aggregated customer feedback from verified sources. We contact each vendor with pre-sale questions and evaluate response time, helpfulness, and professionalism.
Quick Comparison: All 8 Vendors at a Glance
| Vendor | Best For | Purity | Price Range | Testing Lab | Shipping | Rating |
|---|---|---|---|---|---|---|
| Core Peptides | Best Overall | 98-99% | $$ | Janoshik, Colmaric | 2-4 days | 9.5/10 |
| Limitless Biotech | Best Quality | 98-99%+ | $$$ | Janoshik | 3-5 days | 9.3/10 |
| SwissChems | Best Selection | 97-99% | $$ | Third-party verified | 2-5 days | 9.2/10 |
| BioLongevity Labs | Most Transparent | 98-99% | $$$ | Triple-tested (3 labs) | 3-5 days | 9.1/10 |
| Raw Amino | Best Value | 97-98% | $ | Third-party verified | 3-5 days | 8.8/10 |
| Paradigm Peptides | Best for Beginners | 98%+ | $$ | Third-party verified | 2-4 days | 8.7/10 |
| Amino Asylum | Budget Pick | 95-98% | $ | In-house + third-party | 3-7 days | 8.3/10 |
| PureRawz | Runner Up | 97-99% | $$ | Third-party verified | 3-5 days | 8.5/10 |
Price key: $ = Budget-friendly | $$ = Mid-range | $$$ = Premium
Detailed Vendor Reviews
1. Core Peptides – Best Overall
Core Peptides has built one of the strongest reputations in the research peptide space. They consistently appear at the top of community recommendations on Reddit and peptide forums – and for good reason. Every batch is tested through independent labs including Janoshik Analytical and Colmaric Analyticals, with COAs readily available on their website.
Their purity numbers regularly hit 98-99% across their product line, verified through HPLC testing. What sets Core Peptides apart is the combination of quality and pricing – they’re not the cheapest, but they offer strong value when you factor in the verified purity and reliable delivery.
The product catalog covers all major research peptides including BPC-157, TB-500, GHK-Cu, Semaglutide, CJC-1295/Ipamorelin, and PT-141. They also stock peptide blends and offer both lyophilized powder and pre-mixed options for select products.
Pros
- Independently verified 98-99% purity via Janoshik and Colmaric
- Fast shipping – most orders arrive in 2-4 business days
- Strong community reputation with consistent positive feedback
- Competitive mid-range pricing
- Good product selection across all major categories
Cons
- No international shipping to some countries
- Occasional stock issues on popular peptides
- Website design could be more polished
2. Limitless Biotech – Best Quality
If purity is your top priority and you’re willing to pay a premium, Limitless Biotech is the vendor to look at. They’ve positioned themselves as the quality leader in the space, and their lab results back it up. Independent testing through Janoshik Analytical consistently shows purity levels at 98-99%+, with some batches hitting 99.5%.
Limitless uses both HPLC for purity analysis and Mass Spectrometry for identity verification on every batch. Their COAs are detailed and include full chromatograms – not just a purity percentage on a generic template. This level of documentation is rare in the industry.
The trade-off is price. Limitless Biotech runs 15-25% higher than mid-range vendors for comparable products. Whether that premium is worth it depends on your research requirements. For sensitive applications where purity matters, the extra cost pays for itself.
Pros
- Industry-leading purity levels (98-99.5%)
- Detailed COAs with full chromatograms
- Dual testing methods (HPLC + Mass Spec)
- Excellent packaging and cold-chain shipping
- Responsive customer support
Cons
- Premium pricing – 15-25% above average
- Smaller product catalog than some competitors
- Shipping can take 3-5 days
3. SwissChems – Best Selection
SwissChems is one of the most established names in the research chemical space, and their peptide catalog reflects that. With 60+ peptide products available – including hard-to-find compounds – they offer the widest selection of any vendor on this list. If you need something beyond the standard BPC-157 and TB-500, SwissChems probably stocks it.
Purity consistently tests in the 97-99% range through third-party verification. They provide COAs for all products, though the level of detail varies by product. Their testing is solid but not quite as rigorous as Limitless Biotech or BioLongevity Labs.
Where SwissChems also stands out is their range of formats. They carry peptides as lyophilized powder, oral capsules, nasal sprays, and pre-mixed solutions. They also stock SARMs, nootropics, and other research compounds – making them a one-stop shop for researchers working across multiple categories.
Pros
- Largest product selection (60+ peptides)
- Multiple formats (powder, capsules, sprays, solutions)
- Established brand with years of track record
- Competitive pricing with regular promotions
- Cryptocurrency payment accepted
Cons
- COA detail varies by product
- Website can be overwhelming for beginners
- Customer service response time inconsistent
4. BioLongevity Labs – Most Transparent
BioLongevity Labs has carved out a unique position by being the most transparent vendor in the space. Their signature practice is triple testing – every batch is tested by three independent labs before being listed for sale. This approach is overkill by industry standards, but it gives buyers an unprecedented level of confidence in what they’re getting.
Purity results consistently land at 98-99% across all three testing labs, verified through HPLC analysis. The fact that three separate labs produce matching results eliminates any concern about a single lab’s accuracy or potential vendor-lab collusion. All COAs are published directly on product pages.
BioLongevity focuses on longevity and anti-aging peptides specifically. Their catalog is smaller than generalist vendors, but they go deeper on compounds like GHK-Cu, Epithalon, FOXO4-DRI, and NAD+ precursors. If your research focuses on aging and cellular health, their curated selection is an advantage.
Pros
- Triple-tested by 3 independent labs per batch
- Full COAs published on every product page
- Specialized focus on longevity peptides
- Exceptional transparency and documentation
- Educational content on their blog
Cons
- Premium pricing reflects the triple-testing costs
- Smaller catalog – focused on longevity compounds
- Limited format options (mostly lyophilized powder)
5. Raw Amino – Best Value
Raw Amino hits the sweet spot between price and quality. Their peptides are 20-30% cheaper than premium vendors while still maintaining 97-98% purity verified through third-party testing. For budget-conscious researchers who still want verified quality, they’re hard to beat.
The pricing advantage is most noticeable on high-demand peptides. Their BPC-157 (5mg) runs around $28 compared to $35-45 at premium vendors – a significant difference for researchers placing regular orders. They also offer bundle discounts that bring per-unit costs even lower.
Raw Amino provides COAs for all products, and their testing is handled by reputable third-party labs. Purity sits slightly below the premium tier but remains well within acceptable ranges for research purposes. Shipping is reliable at 3-5 business days, though packaging is more basic than premium competitors.
Pros
- 20-30% lower prices than premium vendors
- Verified 97-98% purity via third-party testing
- Bundle discounts for bulk orders
- Good selection of popular peptides
- Straightforward ordering process
Cons
- Purity slightly below premium vendors
- Basic packaging – no cold-chain shipping
- Customer service limited to email
- Fewer format options
6. Paradigm Peptides – Best for Beginners
Paradigm Peptides makes the research peptide buying process as simple as possible. Their website is clean and well-organized, product descriptions include detailed information about each compound, and their customer support team actually responds with helpful answers. For first-time buyers, this matters more than most people realize.
Each product page includes a clear explanation of what the peptide is, relevant research references, and storage instructions. They also maintain an active blog with educational content about peptide handling, reconstitution, and storage – resources that more experienced researchers take for granted but beginners desperately need.
Quality-wise, Paradigm Peptides holds up well. Purity tests at 98%+ through third-party verification, and COAs are available for all products. They carry a solid selection of mainstream peptides without overwhelming new buyers with obscure compounds.
Pros
- Clean, beginner-friendly website
- Detailed product descriptions with research references
- Responsive and helpful customer support
- Educational blog and resources
- 98%+ verified purity
Cons
- Slightly higher prices than value vendors
- Catalog focused on mainstream peptides only
- Limited advanced/niche compounds
7. Amino Asylum – Budget Pick
Amino Asylum offers some of the lowest prices in the peptide market. Their BPC-157 (5mg) starts around $23 – nearly half the price of premium vendors. For researchers running multiple experiments on a tight budget, these savings add up fast.
The catch? Quality is less consistent. Purity ranges from 95-98% depending on the batch and product. Some of their testing is done in-house rather than through independent labs, though they do submit select batches to third-party labs. COAs are available but not always as detailed as what you’d get from higher-tier vendors.
Amino Asylum also stocks a wide range beyond peptides – including SARMs, nootropics, and PCT compounds. The website design is functional but dated, and shipping can take 3-7 business days. Customer service is hit-or-miss based on community reports, with some buyers praising quick responses and others reporting delays.
Pros
- Lowest prices on many popular peptides
- Wide product range beyond peptides
- Ready-to-use pre-mixed solutions available
- Regular sales and discount codes
Cons
- Inconsistent purity (95-98%)
- Mix of in-house and third-party testing
- Slower shipping (3-7 days)
- Customer service inconsistency
- Dated website
8. PureRawz – Runner Up
PureRawz is a well-established vendor that doesn’t top any single category but performs solidly across the board. Purity tests at 97-99% via third-party labs, pricing falls in the mid-range, and their product selection is respectable with 40+ peptides available.
One area where PureRawz stands out is format variety. They offer peptides as lyophilized powder, liquid solutions, nasal sprays, and transdermal creams. This range of delivery methods is useful for researchers exploring different administration routes.
PureRawz also has a loyalty rewards program that gives returning customers points toward future purchases – a nice perk that effectively reduces per-order costs over time. Their website is modern and easy to use, with clear product categorization and filtering.
Pros
- Solid all-around performance
- Wide format variety (powder, liquid, spray, cream)
- Loyalty rewards program
- Modern, user-friendly website
- 40+ peptides in stock
Cons
- Doesn’t lead in any single category
- Pricing slightly above value vendors
- COA accessibility could be improved
How to Spot Fake Peptide Vendors
For every legitimate peptide company, there are several sketchy ones. Here are the red flags that should make you walk away:
No Certificates of Analysis
If a vendor doesn’t provide COAs, don’t buy from them. Period. Legitimate companies test every batch and make results available. If they claim to test but won’t show you the results, that tells you everything you need to know.
In-House Testing Only
A company testing its own products is like a student grading their own exam. Third-party testing through labs like Janoshik, MZ Biolabs, or Colmaric is the industry standard. In-house HPLC results are better than nothing, but they shouldn’t be the only verification.
Prices That Are Too Good to Be True
Peptide synthesis is expensive. If a vendor is selling BPC-157 at half the market rate, they’re either underdosing, selling degraded product, or operating on margins that can’t sustain quality control. Compare prices across multiple vendors – outliers on the low end are suspect.
No Physical Address or Contact Information
Legitimate businesses have real addresses and multiple contact methods. A vendor with only a Gmail address and no phone number or physical location is a risk. Check for LLC or corporation registration as well.
Generic or Templated COAs
Some vendors use fake COAs – documents that look official but aren’t from real labs. Check the lab name on the COA and verify it exists. Look for specific batch numbers, testing dates, and detailed results. A one-page document showing only “99% purity” with no methodology or chromatogram data is likely fabricated.
No Community Presence
Search Reddit, peptide forums, and review sites for the vendor name. A company with zero online discussion – no reviews, no mentions, nothing – is either brand new or operating under a name change after burning a previous reputation. Either way, proceed with caution.
Frequently Asked Questions
What is the best peptide company in 2026?
Based on our testing and evaluation, Core Peptides is the best overall peptide company in 2026. They offer verified 98-99% purity through independent lab testing (Janoshik and Colmaric), competitive mid-range pricing, and reliable 2-4 day shipping. For buyers prioritizing pure quality above all else, Limitless Biotech is the premium alternative.
How do I verify if a peptide vendor is legitimate?
Check for third-party Certificates of Analysis (COAs) from recognized labs like Janoshik Analytical, MZ Biolabs, or Colmaric Analyticals. Verify the COA includes HPLC purity data and Mass Spectrometry identity confirmation. Also look for a physical business address, multiple contact methods, and a positive reputation on Reddit and peptide community forums.
What purity level should I look for in research peptides?
Look for peptides with a minimum of 97% purity as verified by HPLC testing. Premium vendors consistently deliver 98-99%+ purity. Anything below 95% suggests poor synthesis or degradation. Always confirm purity through the vendor’s published COA rather than relying on product page claims alone.
Are cheap peptides safe to use for research?
Low-priced peptides aren’t automatically unsafe, but they require extra scrutiny. Budget vendors may cut costs on quality control, testing frequency, or raw materials. Always verify that even budget peptides come with third-party COAs showing acceptable purity levels (97%+). Suspiciously cheap prices – significantly below market average – are a red flag for underdosed or degraded products.
What is HPLC testing and why does it matter for peptides?
HPLC (High-Performance Liquid Chromatography) is the gold standard for measuring peptide purity. It separates compounds in a sample and measures the percentage of the target peptide versus impurities, synthesis byproducts, and degradation products. A legitimate COA should show an HPLC chromatogram with a clear dominant peak representing the target peptide at 97%+ purity.
Do peptide companies ship internationally?
Most US-based peptide companies ship domestically within 2-5 business days. International shipping availability varies by vendor and destination country. SwissChems and PureRawz offer the widest international shipping coverage. Some countries have import restrictions on research peptides, so check your local regulations before ordering internationally.
What’s the difference between lyophilized peptides and pre-mixed solutions?
Lyophilized (freeze-dried) peptides come as a powder that must be reconstituted with bacteriostatic water before use. They have a longer shelf life and are more stable during shipping. Pre-mixed solutions are ready to use immediately but have a shorter shelf life and are more sensitive to temperature during transit. Lyophilized is generally preferred for stability and storage.
How should I store research peptides?
Unreconstituted (lyophilized) peptides should be stored in a freezer at -20 degrees C for long-term storage, or refrigerated at 2-8 degrees C for short-term use. Once reconstituted, peptides should be refrigerated and used within 30 days. Keep all peptides away from direct light and avoid repeated freeze-thaw cycles, which accelerate degradation.
Final Thoughts
The peptide vendor you choose directly affects the quality of your research. A 5% difference in purity might save you a few dollars upfront but can compromise results and waste time in the long run.
Our recommendation for most buyers is Core Peptides – they hit the best balance of verified purity, fair pricing, and reliable service. If budget is your priority, Raw Amino delivers solid quality at the lowest prices. And if you need the absolute highest purity available, Limitless Biotech is worth the premium.
Whichever vendor you choose from this list, you’re buying from a company that’s been vetted for quality, transparency, and reliability. That’s more than most peptide buyers can say.
Last updated: February 2026. We re-evaluate vendors quarterly and update this guide as needed.