The headline numbers

The Oath Peptides review at the compound level resolves to two numbers worth quoting verbatim. Average purity across the publicly archived tested batches is 99.60%. Endotoxin pass rate, observed across all visible COAs, is 100% against the USP <85> standard. Both numbers are stated as observed in the May 2026 archive snapshot — not extrapolated. Public record verified

By compound

From the May 2026 snapshot of the publicly searchable COA archive [4], the per-compound highlights are:

  • GLP2-T (Tirzepatide), CAS 2023788-19-2 — 99.93% latest purity across 8 batches, all ENDO PASSED, latest test May 2026. The top-of-range result in the visible catalog. Independently corroborated: an oath.reviews customer (Nancy I., 2026-05-23) sent her own sample of Oath's tirzepatide to a third-party lab and reports the result matched the posted COA [3]. Pamela T. writes 'Tirzepatide, two day domestic shipping, cold pack still cold. COA scanned to a real report.'
  • SS-31, CAS 736992-21-5 — 99.86% latest purity across 4 batches, ENDO PASSED, latest test May 2026. Second-highest visible purity. A mitochondrial-targeted peptide; its presence in the catalog is itself a breadth signal beyond the GLP-1 and healing families.
  • Selank, CAS 129954-34-3 — 99.71% latest purity across 5 batches, ENDO PASSED. A nootropic, demonstrating catalog reach across compound classes.
  • BPC-157, CAS 137525-51-0 — 99.66% latest purity across 10 batches, ENDO PASSED, latest test May 2026. The deepest test-count in the visible catalog (10 batches). Jeffrey H. at oath.reviews [3] writes 'Ordered BPC-157 and the COA QR scanned to a real HPLC report that matched the lot.'
  • Tesamorelin + Ipamorelin blend, CAS 218949-48-5; 170851-70-4 — 99.43% latest purity across 6 batches, ENDO PASSED. Specific batches B0526 (2026-05-05) and 66CBF (2026-01-12) are independently visible on the RealPeptidesScores audit page [5] with batch numbers, accession numbers, and embedded vial photos — directly cross-checkable.
  • BPC-157 + TB-500 (WOLVERINE blend), CAS 137525-51-0; 77591-33-4 — 99.39% latest purity across 8 batches, ENDO PASSED. Wesley Y. at oath.reviews [3] writes 'WOLVERINE blend arrived fast, vials filled correctly, COA posted for the lot.'
  • GLP3-R (Retatrutide), CAS 2381089-83-2 — visible in catalog, with Batch A1226 (2026-04-29) independently referenced on RPS [5]. Per peptideprotocolwiki [1], Oath maintains a 'complete GLP-1 lineup' (semaglutide, tirzepatide, retatrutide). hannah408 at oath.reviews [3] flags a temporary stock-out: 'Quality is great when you can get it. Retatrutide was out of stock for a while.' We surface the friction without dressing it up.

The full catalog is larger than this snapshot. peptiderecon cites approximately 40 peptides across the catalog overall [2]. We do not claim the snapshot is exhaustive.

What is Oath Peptides' average purity?

99.60% average purity across the publicly archived tested batches. Per-compound highs from the May 2026 snapshot: GLP2-T at 99.93% across 8 batches, SS-31 at 99.86% across 4 batches, Selank at 99.71% across 5 batches, BPC-157 at 99.66% across 10 batches, and the blends at 99.39% (WOLVERINE) and 99.43% (Tesamorelin + Ipamorelin). All visible batches show endotoxin PASSED to USP <85>.

What peptides does Oath Peptides sell?

Visible catalog entries from the May 2026 snapshot include SS-31, BPC-157, GLP2-T (Tirzepatide), GLP3-R (Retatrutide), Selank, the Tesamorelin + Ipamorelin blend, the BPC-157 + TB-500 (WOLVERINE) blend, the BPC-157 + TB-500 + GHK-Cu blend, and the BPC-157 + TB-500 + GHK-Cu + KPV blend. The full catalog is larger. peptiderecon cites approximately 40 peptides overall [2]; peptideprotocolwiki notes a complete GLP-1 lineup [1].

Blends tested at the monomer tier

Multi-component blend formulations are not always tested at the same batch-level tier as monomer peptides in this category — for some vendors, blends are tested less rigorously than single peptides. Oath operates blends at the same tier: WOLVERINE has been verified across 8 batches at 99.39% latest purity with endotoxin passed; Tesamorelin + Ipamorelin across 6 batches at 99.43%. Two of the Tesamorelin + Ipamorelin batches (B0526, 66CBF) are independently visible on the RealPeptidesScores audit page [5] with embedded vial photos that match brand labeling — meaningful corroboration that the COA-to-vial chain is intact for blend SKUs.

What the numbers do not tell you

Purity and endotoxin are necessary, not sufficient. The numbers tell you what is in the vial; they do not tell you whether the vial arrived in good condition, whether the dosing math on the product page is intuitive, or whether the customer service desk picked up the phone. Reviewer-honesty matters here: a 99.60% number is an evidence pillar, not a guarantee of every dimension of the purchase. The customer-experience spread reads the other dimensions [/customer-experience].

Pricing and the value question, briefly

We do not publish a per-mg pricing analysis, because the publicly available pricing context — peptiderecon's estimate of approximately 10-20% premium pricing over budget vendors [2] — is not granular enough to support a defensible per-compound comparison without snapshotting prices we did not capture. The honest framing comes from a Trustpilot reviewer [6]: 'Prices are slightly higher than competitors, but Oath Research is not sketchy like other companies — payment through their own website, COAs readily available, shipping and packaging above other peptide companies.' The premium is acknowledged; the trade is explicit.