Built for careful
research workflows.
Lot-specific analytical documentation,
published where a certificate is available.
Who we are.
Phase 1 Peptides is a U.S.-based supplier of research-use-only compounds built around clear catalog information, lot-specific documentation where available, tracked fulfillment, and straightforward pricing.
We carry over 40 research compounds across five categories, including Metabolic & Endocrine, Musculoskeletal & Growth, Cellular & Longevity, Neuropeptides & Immunology, and Reproductive & Hormonal, along with reconstitution supplies. Every product is intended exclusively for laboratory research and in vitro studies.
We are not a compounding pharmacy, an outsourcing facility, or a clinical supplier. That singular focus is what allows us to do one thing exceptionally well.
Why we built this.
The research peptide space has a trust problem. Too many suppliers cut corners on testing, obscure their sourcing, or make it difficult to verify what you're actually buying. We built Phase 1 to be the opposite of that.
The linked certificate—not a site badge—is the source of truth for a published lot record.
Our analytical documentation process.
Lot-specific analytical records from third-party laboratories are published where available. The linked certificate is the source of truth for each reported method and result.
Purity (HPLC)
When a linked certificate reports HPLC, we display the laboratory-reported purity value for that specific lot.
Identity (Mass Spec)
When a linked certificate reports mass spectrometry, the certificate provides the laboratory's method and observed result for that lot.
Select compounds also include additional analyses such as net peptide content where applicable. Lot-specific analytical records are published as Certificates of Analysis where available — see the Lab Tests page.
40+ research-use-only compounds. Lot-specific third-party laboratory records are published where available.