Oath Peptides product quality: purity, endotoxin, and catalog coverage

The headline numbers

The Oath Peptides review at the compound level resolves to two numbers worth quoting verbatim. The published average purity over the trailing twelve months is 99.64%, sitting on the same page as a 500-plus-batch archive — a twelve-month figure, not an all-time one, and this review reports it that way. Oath's lab-results archive names USP <85> as its endotoxin standard and states that endotoxin safety is confirmed by an independent laboratory; the certificates we opened report purity and identity and note only that other batches of the same product have been endotoxin-tested. Both numbers are stated as observed, not extrapolated.

By compound

From this review's own sampling of the searchable COA archive ^[4], the per-compound highlights are. Note that the archive has since grown to 518 batches and September 2026, so per-compound test counts have moved:

• GLP2-T (Tirzepatide), CAS 2023788-19-2 — 99.93% latest purity across 8 batches, certificate sampled 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, certificate sampled 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. A nootropic, demonstrating catalog reach across compound classes.
• BPC-157, CAS 137525-51-0 — 99.66% latest purity across 10 batches, certificate sampled 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. 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. 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?

99.64% average purity over the trailing twelve months, published alongside a 500-plus-batch archive. Per-compound highs from this review's own sampling: GLP2-T at 99.93%, SS-31 at 99.86%, Selank at 99.71%, BPC-157 at 99.66%, and the blends at 99.39% (WOLVERINE) and 99.43% (Tesamorelin + Ipamorelin). USP <85> is cited as Oath's endotoxin standard on the archive summary rather than reported per certificate.

What peptides does Oath Peptides sell?

Catalog entries captured in this review's sampling 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

Vendors do not always test multi-component blends as carefully as monomer peptides, which are single peptides. Some give blends less rigorous batch-level testing. Oath applies that same testing tier to blends. For WOLVERINE, the latest purity is 99.39%, based on checks across 8 batches. Tesamorelin + Ipamorelin shows 99.43% latest purity across 6 batches. Two Tesamorelin + Ipamorelin batches, B0526 and 66CBF, can be checked independently on the RealPeptidesScores audit page ^[5]. The embedded vial photos match the brand labels. This supports the link between the COAs and labeled vials for those 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 99.64% 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.