Cornerstone Peptide Co.

CORNERSTONE PEPTIDE CO.

Custom Peptide Synthesis · Analytical-Grade Supply

Commercial Peptide Supply

Commercial peptide synthesis and supply, documented on every lot.

Cornerstone Peptide Co. supplies lyophilized peptides, bulk active pharmaceutical ingredient, and custom synthesis to compounding pharmacies, contract research organizations, and manufacturers. Every lot ships with a Certificate of Analysis and is available for independent third-party verification.

We are the U.S. supply partner for an FDA-inspected peptide facility — we handle your account, documentation and independent verification; the facility manufactures.

Our Guarantee

Every lot ships with a Certificate of Analysis. We pay for independent third-party verification (Janoshik or Auxilium) on the first lot of any molecule — and replace or credit any lot that fails. We compete on the paper trail, not on price.

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RP-HPLC · 220 nmmain peak 98.4%
0.0RT 6.21min 12.0
Specimen

Certificate of Analysis

Document № COA-0188-26 · Issued 22 April 2026

Identity
GHK-Cu
Lot №
CP-GHK-2604-018
Substance
Copper Tripeptide-1
Purity (RP-HPLC)
≥ 98.0 %
Identity (LC-MS)
Conforms
Endotoxin (LAL)
< 0.05 EU/mg
Heavy Metals (Q3D)
Conforms
Bioburden
< 10 CFU/g
Water (Karl Fischer)
≤ 6.0 %

Quality Assurance

Released by

CPVerified2026

Illustrative specimen. This document accompanies every shipment; independent verification available on request.

Why Cornerstone

Built for commercial supply, documented for the record.

Cornerstone Peptide Co. supplies peptide API and custom synthesis with per-lot analytical documentation and independent verification on request.

The buyers we serve — compounding pharmacies, contract research organizations, biotech and pharmaceutical manufacturers, and analytical labs that need characterized reference material — all want the same two things: peptides in the quantities they need, and the documentation to stand behind every milligram.

We supply lyophilized powder and bulk active ingredient, and we synthesize custom sequences to order — with modifications, purification and an analytical package specified to your protocol. What we do not do is as important: no finished or injectable dose forms, and no patented or FDA-approved drug substances.

The Standard

Every lot: one Certificate of Analysis, with HPLC and mass-spec identity — plus independent verification on request.

We do not compete on price. We compete on the paper trail.

Our Commitments

i.

Documented Origin

Synthesis records and a per-lot Certificate of Analysis with every shipment. Manufacturing-partner credentials disclosed to qualified buyers under confidentiality.

ii.

Twice Verified

Manufacturer COA plus independent third-party verification (Janoshik or Auxilium) available on any lot, on request.

iii.

Supply Formats

Lyophilized powder and bulk active pharmaceutical ingredient. Custom synthesis to your sequence, scale and purity target. We supply API and research material — not finished or injectable dose forms.

iv.

Direct Carriage

Material ships directly from the manufacturing partner with cold-chain handling and full documentation — the shortest chain to your facility.

Cornerstone by the Numbers

≥0%

Minimum HPLC purity — every catalog lot

0×

Verification — factory COA + independent third-party (Janoshik / Auxilium) on request

<0 hr

Response time on quote requests

0 day

Business-day lot-release documentation turnaround

Every lot, every shipment, every buyer — the same standards apply. No exceptions, no tiered service.

Catalog

Peptide categories.

i.

Tissue Repair & Recovery

Research reagents commonly requested in repair, recovery, and related specialty studies.

Reparative

ii.

Growth Factor Modulators

Growth-factor-pathway research compounds for laboratory study and product development.

Endocrine

iii.

Neuropeptides & Bioregulators

Neuroactive peptides and bioregulator fragments supported by product-specific documentation.

Neuro

“Quality is not a marketing claim. It is a paper trail — from the synthesizer's logbook to the chromatogram on your desk.”
The Cornerstone Operating Principle

Request pricing and availability.

Tell us your company and the molecules you need. We respond within one business day with pricing, documentation, and a confidential introduction.

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