Peptide Sciences
peptidesciences.com ↗Peptide Sciences voluntarily shut down operations on March 6, 2026. The company is no longer selling products. Do not enter payment information on any site claiming to be Peptide Sciences — Finnrick has confirmed that any site still operating under this name is fraudulent. If you have unfulfilled orders, initiate a chargeback with your bank immediately.
What Happened
On March 6, 2026 at approximately 2:00 PM Eastern, peptidesciences.com went offline and was replaced with a single message:
“After careful consideration, Peptide Sciences has made the decision to voluntarily shut down operations and discontinue the sale of our research products. We are deeply grateful for your trust and support. Thank you for being part of the Peptide Sciences community.”
No further explanation. No refund process. No mention of outstanding orders or customer data.
Why It Matters
Peptide Sciences was the largest grey-market research peptide vendor in the United States. At its peak, the company was generating $7.4 million in monthly online sales (December 2025, per Grips Intelligence) with over one million website sessions per month. Their catalog covered dozens of peptides including BPC-157, TB-500, CJC-1295, ipamorelin, semaglutide, tirzepatide, and retatrutide.
The word “voluntarily” in their shutdown notice is the most revealing detail. Dr. Steven Murphy, writing on Substack, called the closure “something quietly seismic” and observed that Peptide Sciences “existed in the strange legal twilight that has defined the peptide market for years.” The company appears to have read the enforcement trajectory — FDA raids, DOJ prosecutions, ITC exclusion orders, the SAFE Drugs Act — and chosen to close before regulators forced them to.
Prior Assessment (Pre-Shutdown)
PeptideExaminer rated Peptide Sciences B+ prior to the shutdown — the highest grade in our vendor directory. That assessment was based on:
What they did well: Comprehensive COAs published for most products. Claimed WHO/GMP and ISO-certified manufacturing partners. Broad product catalog. Consistent (if expensive) pricing. Long operating history (10+ years). Responsive customer service.
What concerned us: No independent endotoxin testing published. “Research use only” legal positioning increasingly untenable. Payment processing was unstable — the company relied on Venmo, Zelle, Cash App, and cryptocurrency because traditional processors kept cutting them off. That payment instability was itself a red flag about the sustainability of the business model.
Finnrick Testing Record
Finnrick’s independent testing of 123 Peptide Sciences samples across 10 products revealed significant quality inconsistency:
| Peptide | Finnrick Rating | Avg Score | Samples Tested |
|---|---|---|---|
| Ipamorelin | A | 9.2/10 | 9 |
| PT-141 | A | — | — |
| BPC-157 | A | 7.8/10 | — |
| CJC-1295 | E | 4.3/10 | — |
| Tesamorelin | E | — | — |
| Retatrutide | E | — | 37 (counterfeit flagged Nov 2025) |
The pattern is telling: well-established, simpler peptides tested well. Newer, more complex compounds — especially retatrutide — were significantly below standard, with evidence of counterfeits entering the supply chain.
This data reinforces a point PeptideExaminer has made consistently: even the “best” grey-market vendors operate without the quality controls that regulated pharmaceutical manufacturing provides. A B+ in the grey market was never equivalent to pharmaceutical-grade.
What This Means for Former Customers
Immediate steps:
- Do not buy from any site claiming to be Peptide Sciences
- If you have unfulfilled orders, contact your bank for a chargeback
- If you have remaining product, note the lot numbers and store properly (lyophilized powder at -20°C; reconstituted at 2-8°C, use within 30 days)
Transition options:
- Compounding pharmacies: If the FDA formally reclassifies Category 2 peptides to Category 1 (still pending), licensed 503A/503B pharmacies will be the safest source. Requires a physician prescription. Typical cost: $150-300/month for BPC-157.
- Telehealth platforms: Hims & Hers, Ro, and multiple smaller platforms now offer physician-supervised peptide protocols. Higher cost than grey market but legally protected and quality-verified.
- Other grey-market vendors: Still operating, but the enforcement trajectory is clear. PeptideExaminer maintains vendor ratings for remaining grey-market vendors, but we strongly encourage transition to regulated channels.
The Larger Pattern
Peptide Sciences is not an isolated case. The grey-market model for injectable peptides is under sustained, coordinated pressure from federal enforcement:
- Amino Asylum: FDA warehouse raid, June 2025. Shut down overnight.
- All American Peptide: Owners pleaded guilty to conspiracy. $3M+ forfeitures.
- Tailor Made Compounding: Federal conviction. $1.79M forfeiture.
- Prime Peptides, SwissChems, Xcel Peptides, Summit Research: FDA warning letters, December 2024.
- Strate Labs, Arctic Peptides, Triggered Brand: ITC cease and desist orders, January 2025.
- 7+ vendors shut down throughout 2025.
The pattern is unmistakable: the regulatory and legal framework that tolerated the “research use only” model is collapsing. Peptide Sciences — the largest, most recognizable, highest-rated vendor in the space — chose to exit rather than wait for the collapse to reach them.
This profile was originally published as a vendor review with a B+ rating. It has been updated to reflect the March 6, 2026 shutdown. PeptideExaminer’s original rating methodology and scoring are preserved above for transparency.