No supplier is declared a winner. Catalogue size, price and claimed purity are not evidence of anything this comparison can verify, and none of it is a recommendation to purchase for human use.
| Criterion | American Peptides | Behemoth Labz | BioInfinity | Biotech Peptides | Blue Sky Peptide | Core Peptides | Limitless Life Nootropics | Loti Labs | Nootropic Source | NuScience Peptides | Sports Technology Labs | Swiss Chems |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Certificates lot-specific | Yes — confirmed on a sampled certificate | Yes — confirmed on a sampled certificate | Could not verify | Yes — confirmed on a sampled certificate | Could not verify | Yes — confirmed on a sampled certificate | Could not verify | Yes — confirmed on a sampled certificate | Could not verify | Could not verify | Yes — confirmed on a sampled certificate | Yes — confirmed on a sampled certificate |
| Testing laboratory named | Bioviridian, College Station TX — named principal chemist, certificate lookup resolves; no accreditation number cited | MZ Biolabs, Tucson AZ — named analytical chemist; certificate address differs from the laboratory’s published address; no accreditation number cited | Verum Analytics, Basel, Switzerland — not a US laboratory; no accreditation number published | MZ Biolabs, Tucson AZ — named analyst on the certificate | Not named — no laboratory, contact details or accreditation number published on any page fetched | Vanguard Laboratory, Olympia WA — ISO 17025:2017, A2LA certificate #6377.01.01 cited | None named — quality statement refers to "three different independent labs" without naming any | S.R. Bio Labs, Orlando FL — named analyst and certificate lookup; no accreditation number cited | Not named — certificates are issued on the supplier’s own letterhead with no signature or accreditation number | Freedom Diagnostics — named principal chemist, but no address, phone or accreditation number on the certificate; the laboratory’s site returned HTTP 403 | MZ Biolabs, Tucson AZ — named analyst and laboratory contact email published | Janoshik Analytical — reports carry a customer-verifiable unique key |
| Analytical methods shown | RP-HPLC at 214 nm with chromatogram, MALDI-MS identity with spectrum, heavy metals by USP<232>, endotoxin by USP<85> | Stated as HPLC-UV-MS, with a chromatogram and peak list reproduced; no separate mass spectrum on the certificate examined | Cited as HPLC-UV/MS with purity figures only; no chromatogram or spectrum found on any page fetched | HPLC-UV-MS with chromatogram and peak list | Product pages state "Mass Spectrometry and UV" with a purity figure only; no chromatogram or spectrum published | HPLC-UV/VIS with chromatogram. No LC-MS identity report observed. | Claims HPLC and LC-MS on every batch; no viewable certificate found against which to check | UV 214–290 nm, HPLC for purity and LC-MS for identity, with both a chromatogram and a mass spectrum reproduced | HPLC purity figure; mass spectrometry recorded only as "Consistent", with no chromatogram or spectrum reproduced | HPLC with UV detection coupled to mass spectrometry, with a chromatogram and a mass spectrum reproduced; no expected mass printed for comparison | HPLC-UV-MS with chromatogram and peak list | Quality page states HPLC, LC-MS, NMR or equivalent; the report examined prints the result but not the method name |
| US business address | City only — "Shreveport, LA". No street address or suite published. | Not published — email and a toll-free number only; the contact page returned HTTP 404 | BioInfinity LLC, 1460 Broadway, Manhattan, NY 10036 — no suite, floor or unit number published | 8275 S Eastern Ave, Suite 200, Las Vegas, NV 89123 | Not published on the homepage, About page, footer, shipping policy or terms | 5401 S Kirkman Rd, Suite 310, Orlando, FL 32819 (shared/executive suite) | Partial — "Pensacola, FL USA" with phone and email; no street address found | 1204 S Broad St #336, Brooksville, FL 34601 — whether "#336" is a suite, unit or mailbox could not be verified | Not published on the contact, shipping, returns or legal-disclaimer pages | City only — "Albuquerque, NM", plus a phone number. No street address or suite published. | 494 Bridgeport Avenue, Suite 101-222, Shelton, CT 06484 (mailbox-style suite) | Could not verify — About page states only "Based in USA"; contact page returned HTTP 403 |
| Returns and refunds | All sales final; damaged or incorrect items reportable within 72 hours of delivery with photographs | Returns or exchanges within 30 days of delivery on unopened product; signature required over $200 | Returns within 14 calendar days on product with the tamper-evident seal intact, subject to a 15% restocking fee | 30-day refund guarantee; returns not accepted | Returns requestable within 30 days of purchase, refunded less original shipping or exchanged | Refunds requestable up to 30 days after order; no physical return procedure described | 10-day return-request window with a stated review turnaround | Refunds on unused, unopened product within 30 days; no reshipment once tracking shows delivery | No returns and all sales final; refunds not accepted; missing items replaced after verification | Returns not accepted; damaged, incorrect or missing items handled through support | 60-day money-back guarantee for exchange or full refund | Peptides cannot be returned; other categories 7 business days unopened; 15% restocking fee per item plus $25 processing fee |
| FDA warning letter on record | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | None found in FDA’s dataset | Yes — 2024-12-10 |
| Affiliate relationship | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page | None — no affiliate link appears on this page |
| Observed | 2026-08-05 | 2026-08-05 | 2026-08-05 | 2026-08-04 | 2026-08-05 | 2026-08-04 | 2026-08-04 | 2026-08-05 | 2026-08-05 | 2026-08-05 | 2026-08-04 | 2026-08-04 |