30%
Testing
Depth of Certificate-of-Analysis coverage.
Independent · Apr 2026 · 8 vendors tracked · United States
The best United States peptide vendor,
by protocol — not popularity.
8 research-peptide suppliers, scored against a five-axis protocol: testing depth, stated-purity verifiability, regional fulfilment, price-per-milligram, and trust history. The methodology is published in full. Vendors do not see scores before release, and warning flags override composite rank.
20%
Purity
Stated typical purity, corroborated by lab reports.
15%
EU-Friendliness
EU warehouse, SEPA acceptance, language coverage, EU VAT compliance, delivery time.
15%
Value
Price versus evidence.
20%
Trust
Time in market, review volume and authenticity, incident history.
RANK_01 · Editor's ChoiceVID-CORE-PEP
Core Peptides
USA (domestic) · US · since 2019
9.2/10
99.1% purity3-param COAFree $100+
Testing
9.0
Purity
9.0
EU
10.0
Value
9.0
Trust
9.0
Interactive · 4 questions · 30 seconds
The vendor finder.
Tell us your priorities — we'll name one.
No email required. The finder runs your answers against our weighted scorecard and returns one specific vendor — not a "top 10." Below is a taster: answer the first question to see a live recommendation, or take the full 4-question version →
Q 01 · PRIORITY
What matters most?
▸ Answer to see result
Core Peptides
USA (domestic) · US · since 2019
Top-rated US research peptide vendor with HPLC and LC-MS verified COAs, fast domestic 2–3 day shipping, and free shipping over $100. 4.8/5 Trustpilot from 420+ reviews. Wide produc…
Composite score9.2/10
Stated purity99.1%
Testing params3
Price band€38–160
Leaderboard
The top six. By composite score.
| # | Vendor | HQ | Testing | Purity | EU | Trustpilot | Score | |
|---|---|---|---|---|---|---|---|---|
| 01 | Core PeptidesVID-CORE-PEP | US | 3-param | 99.1% | Yes | 4.8/5 | Review → | |
| 02 | SwissChemsVID-SWISSCHE | US | 2-param | 99.3% | Yes | 4.7/5 | Review → | |
| 03 | QSC PeptidesVID-QSC-PEPT | CN | 3-param | 99.5% | Yes | — | Review → | |
| 04 | Umbrella LabsVID-UMBRELLA | US | 2-param | 99% | Yes | 4.5/5 | Review → | |
| 05 | Chinese Peptide CompanyVID-CPC-PEPT | CN | 3-param | 99% | No | — | Review → | |
| 06 | Biotech PeptidesVID-BIOTECH- | US | 2-param | 99% | Yes | 4.4/5 | Review → |
Head-to-head
Pick any two. See every parameter.
Parameter
VID-CORE-PEP · US
VID-SWISSCHE · US
Composite score
9.2/10
8.4/10
Vendor ID
VID-CORE-PEP
VID-SWISSCHE
Headquarters
USA (domestic)
USA
Founded
2019
2018
Stated purity
99.1%
99.3%
COA params
3 — HPLC, LC-MS, Endotoxins
2 — HPLC, LC-MS
EU warehouse
Yes
Yes
Price band
€38–€160
€22–€150
Shipping free at
$100+
$300+
Trustpilot
4.8/5 · 420
4.7/5 · 0
Affiliate
10% per sale
20% per sale
GDPR
Compliant
Unknown
Payment
Credit card, Debit card, Cryptocurrency
Credit card, Cryptocurrency
Flag status
Clear
Clear