EZ Peptides and PS Peptides are both tracked by PeptidePrices, so this comparison uses the same evidence for both: the published evidence score and its four factors, the certificates of analysis we could match to an exact product and strength, every overlapping listing price, the current reader codes, and each vendor's published shipping and payment terms. Prices reflect the latest listing checks through September 3, 2026. Scores and certificate counts come from each vendor's PeptidePrices review.
Short version: both vendors score 9/10 on our rubric; PS Peptides is cheaper on 10 of 16 directly comparable compounds before coupons; PS Peptides has more in-stock listings backed by an exact issuer-verified certificate (29 vs 4). The right choice depends on which compounds you need and how much weight you put on price versus certificate coverage; the use-case verdicts near the end spell that out.
EZ Peptides vs PS Peptides at a glance
| EZ Peptides | PS Peptides | |
|---|---|---|
| Evidence score | 9/10 | 9/10 |
| COA quality score | Not scored | 9/10 |
| COA program | Public COAs | 115 of 115 certificate identities verified |
| Certificates in the COA library | — | 115 |
| In-stock listings with an exact verified COA | 4 of 43 | 29 of 29 |
| Laboratories on matched certificates | Janoshik | North American Diagnostics |
| In-stock listings | 43 | 29 |
| Distinct compounds in stock | 30 | 19 |
| Reader code | peptideprices (10% off) | PEPTIDEPRICES (10% off) |
| Ships to | United States only | United States and international destinations |
| Payment methods | Visa, Mastercard, American Express | Credit/debit card, Afterpay, Klarna, Apple Pay, Google Pay, Cash App, Zelle |
| Location | Albuquerque, NM | Paramus, NJ |
| Founded | 2023 | 2020 |
| Review profile | Trustpilot 4.8/5 (169 reviews) | Trustpilot 4.2/5 (156 reviews) |
Evidence score and factor breakdown
PeptidePrices scores every vendor on the same published rubric: 40% COA practices, 20% community reputation, 20% transparency, and 20% operations. Affiliate relationships are not a scoring factor. Read the full methodology.
| Factor (weight) | EZ Peptides | PS Peptides |
|---|---|---|
| COA practices (40%) | 9/10 | 9/10 |
| Community reputation (20%) | 10/10 | 9/10 |
| Transparency (20%) | 8/10 | 8/10 |
| Operations (20%) | 8.5/10 | 8/10 |
| Weighted result | 8.9/10 | 8.6/10 |
| Published score | 9/10 | 9/10 |
The factor scores differ on community reputation (EZ Peptides +1), operations (EZ Peptides +0.5). The remaining factors are tied.
Our PS Peptides verdict
PS Peptides earns 9/10. PeptidePrices reconciled its complete retained archive into 115 certificate identities: 74 current and 41 historical. All 115 matched North American Diagnostics records. All 282 retained documents name ProSupply Peptides | pspeptides.com as the client. Every one of the 29 active comparison rows has an eligible exact compound, strength, and unit match, including both BPC-157 rows and all five GLP-3R rows. Trustpilot showed 4.2/5 from 156 exact-domain reviews during the August 2026 check.
Full evidence, strengths, and watch-outs: PS Peptides reviews.
Certificates of analysis (COA) evidence
A certificate only counts here when PeptidePrices matched it to the exact vendor, compound, and strength of a live listing and confirmed it against the issuing laboratory's record. Nearby strengths and historical reports stay in the COA library but do not attach to a listing.
EZ Peptides
4 in-stock listings of 43 carry an exact issuer-verified certificate; the newest matched certificate was analyzed September 5, 2025. Matched certificates by laboratory: Janoshik (4).
PS Peptides
All 115 logical identities matched North American Diagnostics records. The COA library holds 115 certificate records for PS Peptides. 29 in-stock listings of 29 carry an exact issuer-verified certificate; the newest matched certificate was analyzed August 28, 2026. Matched certificates by laboratory: North American Diagnostics (29).
Verified certificates on shared compounds
| Compound | EZ Peptides | PS Peptides |
|---|---|---|
| 5-Amino-1MQ | No exact match | 5mg · North American Diagnostics · July 3, 2026 |
| ARA-290 | No exact match | 10mg · North American Diagnostics · July 30, 2026 |
| BPC-157 | No exact match | 5mg · North American Diagnostics · August 28, 2026 |
| CJC-1295 | No exact match | 5mg · North American Diagnostics · June 11, 2026 |
| CJC-1295 No DAC + Ipamorelin | No exact match | 10mg · North American Diagnostics · June 12, 2026 |
| Epithalon | No exact match | 10mg · North American Diagnostics · June 11, 2026 |
| GHK-Cu | No exact match | 50mg · North American Diagnostics · June 12, 2026 |
| GLOW Protocol | No exact match | 70mg · North American Diagnostics · June 11, 2026 |
| KLOW Protocol | No exact match | 80mg · North American Diagnostics · June 11, 2026 |
| Melanotan-1 | No exact match | 10mg · North American Diagnostics · June 12, 2026 |
| Melanotan-2 | No exact match | 10mg · North American Diagnostics · June 12, 2026 |
| MOTS-c | No exact match | 10mg · North American Diagnostics · June 11, 2026 |
| GLP-3R | 6mg · Janoshik · September 4, 2025 | 5mg · North American Diagnostics · August 28, 2026 |
| SS-31 | No exact match | 10mg · North American Diagnostics · June 15, 2026 |
| Thymosin Alpha-1 | No exact match | 10mg · North American Diagnostics · June 12, 2026 |
| Wolverine Stack | No exact match | 20mg · North American Diagnostics · June 11, 2026 |
Price-by-price: every overlapping compound
The two catalogs share 16 compounds; 16 have a normalized price at both vendors (price divided by vial size, scaled to the compound's standard research amount). Each vendor's cheapest in-stock package per compound is used. Coupon prices apply each vendor's current verified reader code to that package.
| Compound | EZ Peptides packages | PS Peptides packages | EZ Peptides per std. amount | PS Peptides per std. amount | Lower before coupon | Lower after coupon |
|---|---|---|---|---|---|---|
| 5-Amino-1MQ | 50mg $68.00 | 5mg $34.99 | $13.60 / 10mg | $69.98 / 10mg | EZ Peptides (81% less) | EZ Peptides |
| ARA-290 | 10mg $48.00 | 10mg $59.99 | $48.00 / 10mg | $59.99 / 10mg | EZ Peptides (20% less) | EZ Peptides |
| BPC-157 | 10mg $44.00 | 5mg $49.99; 10mg $89.99 | $44.00 / 10mg | $89.99 / 10mg | EZ Peptides (51% less) | EZ Peptides |
| CJC-1295 | 5mg $38.00 | 5mg $35.99 | $76.00 / 10mg | $71.98 / 10mg | PS Peptides (5% less) | PS Peptides |
| CJC-1295 No DAC + Ipamorelin | 10mg $53.00 | 10mg $65.99 | $53.00 / 10mg | $65.99 / 10mg | EZ Peptides (20% less) | EZ Peptides |
| Epithalon | 10mg $38.00 | 10mg $59.99; 50mg $129.99 | $38.00 / 10mg | $26.00 / 10mg | PS Peptides (32% less) | PS Peptides |
| GHK-Cu | 50mg $35.00; 100mg $53.00 | 50mg $29.99; 100mg $39.99 | $5.30 / 10mg | $4.00 / 10mg | PS Peptides (25% less) | PS Peptides |
| GLOW Protocol | 70mg $88.00 | 70mg $69.99 | $12.57 / 10mg | $10.00 / 10mg | PS Peptides (20% less) | PS Peptides |
| KLOW Protocol | 80mg $98.00 | 80mg $89.99 | $12.25 / 10mg | $11.25 / 10mg | PS Peptides (8% less) | PS Peptides |
| Melanotan-1 | 10mg $44.00 | 10mg $39.99 | $44.00 / 10mg | $39.99 / 10mg | PS Peptides (9% less) | PS Peptides |
| Melanotan-2 | 10mg $44.00 | 10mg $39.99 | $44.00 / 10mg | $39.99 / 10mg | PS Peptides (9% less) | PS Peptides |
| MOTS-c | 10mg $54.00 | 10mg $69.99; 50mg $189.99 | $54.00 / 10mg | $38.00 / 10mg | PS Peptides (30% less) | PS Peptides |
| GLP-3R | 6mg $48.00; 10mg $78.00; 12mg $82.00; 20mg $108.00; 24mg $118.00; 48mg $208.00 | 5mg $39.99; 10mg $69.99; 20mg $104.99; 30mg $144.99; 40mg $179.99 | $43.33 / 10mg | $45.00 / 10mg | EZ Peptides (4% less) | EZ Peptides |
| SS-31 | 30mg $98.00 | 10mg $49.99 | $32.67 / 10mg | $49.99 / 10mg | EZ Peptides (35% less) | EZ Peptides |
| Thymosin Alpha-1 | 10mg $58.00 | 10mg $39.99 | $58.00 / 10mg | $39.99 / 10mg | PS Peptides (31% less) | PS Peptides |
| Wolverine Stack | 10mg $53.00; 20mg $88.00 | 20mg $59.99 | $44.00 / 10mg | $30.00 / 10mg | PS Peptides (32% less) | PS Peptides |
Across the 16 directly comparable compounds, EZ Peptides is lower on 6 and PS Peptides on 10 before coupons. After each vendor's reader code the split is EZ Peptides 6, PS Peptides 10. Buying one standard amount of every comparable compound would cost $622.72 at EZ Peptides and $692.12 at PS Peptides before coupons, or $560.45 and $622.91 after them.
Every vendor's price for these compounds: 5-Amino-1MQ, ARA-290, BPC-157, CJC-1295, Epithalon, GHK-Cu, GLOW Protocol, KLOW Protocol, Melanotan-1, Melanotan-2, MOTS-c, GLP-3R.
Catalog breadth
EZ Peptides lists 43 in-stock listings across 30 compounds; PS Peptides lists 29 in-stock listings across 19 compounds. 16 compounds appear at both.
Only at EZ Peptides (14): AOD-9604, Cagrilintide, Ipamorelin, KPV, L-Carnitine, LL-37, Oxytocin, GLP-1S, Sermorelin, Survodutide, TB-500, Tesamorelin, GLP-2T, VIP.
Only at PS Peptides (3): AHK-Cu, CJC-1295, IGF-1 LR3.
Coupon codes
- EZ Peptides: code peptideprices for 10% off, checkout-verified. Terms and checkout steps: EZ Peptides coupon code.
- PS Peptides: code PEPTIDEPRICES for 10% off, checkout-verified. Terms and checkout steps: PS Peptides coupon code.
Coupon-adjusted prices in the table above use these codes. Confirm the discount at checkout before paying; vendors can change terms.
Shipping and payment
EZ Peptides
- Ships to: United States only
- Payment: Visa, Mastercard, American Express
- Shipping terms: EZ Peptides states that orders process in zero to two business days and that orders placed by 2 PM Eastern can qualify for same-day processing. It ships only within the United States, excludes PO boxes and military addresses, and offers free standard shipping over $200. Eligible sealed products have a seven-day return window.
- Testing statement: Public Janoshik report library with task, batch, identity, purity, and measured-content results. Check the linked report because at least one page summary conflicts with its report image.
PS Peptides
- Ships to: United States and international destinations
- Payment: Credit/debit card, Afterpay, Klarna, Apple Pay, Google Pay, Cash App, Zelle
- Shipping terms: The site states that every order ships free and that orders over $200 receive free UPS 2nd Day Air. Its main page and FAQ give different same-day cutoffs, so expect most orders to ship the same or next business day.
- Testing statement: 108 issuer-verified North American Diagnostics certificate identities backed by 254 retained documents; identity, purity, and measured content appear across all identities, with endotoxin and heavy-metals reports for 73 current identities
Transparency and reputation
EZ Peptides lists its location as Albuquerque, NM and was founded in 2023. Its Trustpilot profile showed 4.8/5 from 169 reviews when checked on August 13, 2026. Customer reviews describe service and delivery; they do not verify product identity or laboratory results.
EZ Peptides strengths: The public library has 78 Janoshik links representing 72 unique report images and 69 unique verification keys spanning 2024 through 2026; Sampled reports state a task number, client, product, batch, purity, and measured content; All 69 unique verification keys are included in the PeptidePrices Janoshik corroboration corpus; The owner-confirmed alternate-domain Trustpilot profile shows 4.8/5 from 169 reviews.
EZ Peptides watch-outs: The sampled reports do not include sterility, endotoxin, or heavy-metals results; The MOTS-C page summary conflicts with the values on its linked Janoshik report; A public Reddit thread documents identical report values across related sellers and disputes prior U.S.-production framing; The current site says products are lyophilized in the USA, but PeptidePrices did not verify where they were synthesized.
PS Peptides lists its location as Paramus, NJ and was founded in 2020. Its Trustpilot profile showed 4.2/5 from 156 reviews when checked on August 25, 2026. Customer reviews describe service and delivery; they do not verify product identity or laboratory results.
PS Peptides strengths: Complete retained archive with 115 certificate identities and 282 retained documents and pages; All 115 identities matched official North American Diagnostics records; All 282 retained documents name ProSupply Peptides | pspeptides.com as the client; All 115 identities include identity, purity, and measured-content reports; 80 add endotoxin, 80 add heavy metals, and seven add sterility.
PS Peptides watch-outs: The retained documents print Date Ordered but do not print an analysis or report date; Only the seven newest BPC-157 and GLP-3R identities include a sterility result; All 115 identities come from one issuing laboratory, North American Diagnostics; The GLP-3R 40mg portal summary carries a stale lot, although its three linked official PDFs match the retained lot.
Verdict by use case
- Lowest cost on the shared catalog: EZ Peptides. After reader codes, one standard amount of each of the 16 comparable compounds costs $560.45 there versus $622.91. Check the table for the compound you actually need; the cheaper vendor is not cheaper on every line.
- Most listings backed by an exact verified certificate: PS Peptides (29 in-stock listings, 100% of its catalog).
- More payment options: PS Peptides (Credit/debit card, Afterpay, Klarna, Apple Pay, Google Pay, Cash App, Zelle).
- Shipping outside the United States: PS Peptides (United States and international destinations).
- Wider catalog: EZ Peptides (30 compounds in stock).
- Compounds only one vendor carries: EZ Peptides for AOD-9604, Cagrilintide, Ipamorelin, KPV, L-Carnitine and more; PS Peptides for AHK-Cu, CJC-1295, IGF-1 LR3.
Whichever vendor you choose, match the certificate to the exact product, strength, and lot before relying on it. Full reviews: EZ Peptides reviews and PS Peptides reviews.
PeptidePrices is independently owned and participates in affiliate programs with some vendors. Affiliate status is never a scoring factor, and neither vendor can edit or approve this comparison.
Frequently asked questions
Is EZ Peptides or PS Peptides cheaper?
On the 16 compounds both vendors price by vial size, EZ Peptides is lower on 6 and PS Peptides on 10 before coupons (EZ Peptides 6, PS Peptides 10 after reader codes). One standard amount of each costs $560.45 at EZ Peptides and $622.91 at PS Peptides after codes, based on listing checks through September 3, 2026.
Which has more verified COAs, EZ Peptides or PS Peptides?
EZ Peptides has 4 in-stock listings with an exact issuer-verified certificate; PS Peptides has 29 and 115 library records.
Which labs test EZ Peptides and PS Peptides products?
Matched certificates name Janoshik for EZ Peptides and North American Diagnostics for PS Peptides.
Do EZ Peptides and PS Peptides have coupon codes?
EZ Peptides: peptideprices for 10% off. PS Peptides: PEPTIDEPRICES for 10% off.
Do EZ Peptides and PS Peptides ship internationally?
EZ Peptides ships to United States only. PS Peptides ships to United States and international destinations.
Is EZ Peptides legit?
EZ Peptides scores 9/10 on PeptidePrices' evidence rubric (40% COA practices, 20% reputation, 20% transparency, 20% operations). See the full EZ Peptides review for the evidence behind the score.
Is PS Peptides legit?
PS Peptides scores 9/10 on PeptidePrices' evidence rubric (40% COA practices, 20% reputation, 20% transparency, 20% operations). See the full PS Peptides review for the evidence behind the score.