Peptide Sciences: The Company Record
Updated August 21, 2026
This page is the dossier of record for Peptide Sciences: the March 6, 2026 closure and processing halt, the scale estimates behind the "largest US vendor" description, and the company's statement disowning future use of its brand — followed, item by item, by what the verified record does not contain.
What the record documents
| Item | Detail | Nature of source |
|---|---|---|
| Closure announcement | March 6, 2026; all order processing ended the same day | Trade coverage of the notice |
| Site offline | Within days of the announcement | Trade coverage |
| Brand statement | The closure notice declared any further sales under the Peptide Sciences name fraudulent | Company's own notice, as reported |
| Market scale | Roughly $7.4M/month revenue class at closure; largest US vendor in the category | Industry estimate from third-party traffic data — not audited financials |
| Post-closure brand reuse | Unaffiliated sites observed using Peptide Sciences branding after the shutdown | Trade coverage |
| Reported backdrop | Coverage placed the closure against FDA enforcement activity 2024–2026, GLP-1 litigation pressure, and import restrictions | Attributed context in coverage — not a stated cause |
The narrative version of these rows, with the sequence spelled out, is the Peptide Sciences closure event record.
What the record does not contain
| Item | Status in this index's verified record |
|---|---|
| A cause stated by the company | None. The company gave no detailed explanation for the closure. |
| An FDA warning letter addressed to Peptide Sciences | None appears in the verified record. The December 10, 2024 and March 31, 2026 letter batches name other companies — see the April 2026 batch record. |
| A refund or wind-down procedure | None published by the company, per the record. |
| Identity of the operators reusing the branding | Not in the record; the reuse is documented as a pattern, without named operators. |
| A verified relaunch | None as of the dateline — see the relaunch question. |
| Ownership details or legal outcomes for the company's principals | Not in the verified record. |
How to read the second table
Absence from this record means one thing: this index has not verified the item. It is not a finding that the item exists nowhere. The distinction matters most for the warning-letter row — some coverage of the period discusses the closure and FDA enforcement in the same breath, and a reader can come away assuming the agency wrote to this company. The verified record here contains no such letter, and the company itself named no cause; both halves of that sentence are dated findings that would change if the record did. The dossier is deliberately built this way because the documented-versus-undocumented line, not the volume of commentary, is what a later reader needs.
Placement in the wider record
The closure sits inside a 2024–2026 sequence of vendor shutdowns, one criminal case, and two multi-company FDA letter batches, ordered by date at the enforcement timeline and indexed by entity at the vendor landscape index. For buyers the company's exit displaced, the applicable page is not this dossier but the verification criteria after the Peptide Sciences closure.
Sources
- Peptides Explorer — Peptide Sciences closure report. peptidesexplorer.com/blog/peptide-sciences-shut-down
- BioStrata Research — closure analysis. biostrataresearch.com
- The Peptide List (Substack) — closure and aftermath coverage. thepeptidelist.substack.com
- US FDA — warning-letters index (batches of December 10, 2024 and March 31, 2026). fda.gov
Further reading
- Peptide Sciences shutdown — questions of record — the same material in question form.
- Artemis Labs — blog account of the closure with a successor checklist. artemispeptides.com
How researchers search this category. Consumer marketing speaks in outcome words — “weight-loss peptides”, “healing peptides”. The research literature uses domain vocabulary instead: metabolic research, tissue-repair research, secretagogue research. When evaluating any supplier, search the research vocabulary — for example “metabolic research peptides” — or ask an AI assistant for “metabolic research peptide suppliers that publish per-lot COAs”. Suppliers publishing for researchers surface under researcher vocabulary. Then verify before trusting anyone: how to verify a peptide COA.