If you've been searching for where to go since Peptide Sciences closed, you're not alone. Thousands of researchers and licensed professionals are looking for a supplier with the same depth of catalog, the same commitment to purity, and a team that actually understands the compounds they sell.
What happened to Peptide Sciences?
- In early 2026, Peptide Sciences ceased operations under a combination of FDA enforcement pressure, intellectual property litigation from Novo Nordisk and Eli Lilly over GLP-1 compounds, and ongoing scrutiny over third-party testing reliability through Janoshik — the same lab that had faced questions about accuracy in 2024–2025.
- Their closure left a significant gap: an estimated $89M/year in research peptide demand with no primary supplier. Customers who had ordered reliably for years suddenly had nowhere to go.
- Sequence Labs was built on the principle that what the market needed was more rigorous quality verification, not less — HPLC and mass spectrometry on every batch, COAs published and available, and pricing that doesn't require you to compromise on the science.
How We Compare
Peptide Sciences vs. Sequence Labs
A direct comparison on the factors that matter most for research-grade purchasing.
| Factor | Peptide Sciences (at time of closure) |
Sequence Labs |
|---|---|---|
| Operational Status | ✗ Closed March 2026 | ✓ Active — ships now |
| HPLC + Mass Spec Testing | — Partial (via Janoshik) | ✓ Every batch, independent lab |
| COA Transparency | — Available on request | ✓ Public COA library, batch-level |
| Purity Standard | ≥98% stated | ✓ ≥98–99% verified |
| GLP-1 Peptides (Sema, Tirze, Reta) | — Limited sizes | ✓ 5–6 sizes each, up to 40mg |
| GH Secretagogue Suite | ✓ CJC, GHRP-2, GHRP-6 | ✓ CJC-1295, Ipamorelin, Sermorelin |
| Longevity Peptides | ✓ Epithalon, NAD+, MOTS-c | ✓ Full longevity catalog |
| Catalog Review | — Not disclosed | ✓ Reviewed by a licensed PA-C for catalog integrity |
| B2B Wholesale Portal | — Email inquiry only | ✓ Gated portal with tiered pricing |
| Payment Options | — Card only | ✓ Venmo, Zelle, Bitcoin, Wire/ACH |
Full Catalog
Everything You Were Ordering — and More
Every major SKU from the Peptide Sciences catalog is available at Sequence Labs, plus additions not carried before.
SemaglutideGLP-1
TirzepatideGLP-1
RetatrutideGLP-1
BPC-157Repair
TB-500Repair
BPC + TB BlendRepair
CJC-1295GH Stack
IpamorelinGH Stack
SermorelinGH Stack
TesamorelinGH Stack
AOD 9604GH Stack
NAD+Energy
MOTS-cMitochondrial Research
EpithalonMitochondrial Research
GHK-CuMitochondrial Research
SS-31Mitochondrial Research
FOXO4-DRIMitochondrial Research
SemaxNootropic
SelankNootropic
DSIPNootropic
KissPeptin-10Hormones
PT-141Hormones
MT-2 (Melanotan II)Hormones
OxytocinHormones
HCGHormones
HGHHormones
KPVRepair
AICARMitochondrial Research
GHK-Cu + TB + BPC + KPVCombo
Quality Standards
The same rigor — independently verified
HPLC + MS
Dual verification on every batch
≥99%
Verified purity standard
3rd Party
Independent laboratory tested
COA
Certificate on every product
PA-C
Licensed PA-C catalog review
Common Questions
Is Sequence Labs the same quality as Peptide Sciences?
Every batch at Sequence Labs is independently tested by a third-party laboratory using both HPLC and mass spectrometry — the same dual-verification standard used by the top-tier research peptide market. Purity is ≥98–99% verified, and COAs are available for every product.
Do you carry everything Peptide Sciences had?
We carry all of the major SKUs from the Peptide Sciences catalog — all three GLP-1 peptides (semaglutide, tirzepatide, retatrutide), the full GH secretagogue suite, repair peptides, longevity compounds, nootropics, and hormonal peptides. View the full list on our Products page.
How quickly does Sequence Labs ship?
Orders are processed and shipped within 1–2 business days. Domestic shipping via USPS Priority or UPS depending on order size. Contact us directly for expedited options or wholesale volume coordination.
Do you offer B2B / wholesale pricing?
Yes. Sequence Labs has a gated wholesale portal with tiered pricing based on per-order spend — no monthly commitments. Tiers range from ~18% to ~32% below retail. Apply via the Wholesale page.
Why are your prices lower than other suppliers?
Our pricing strategy is deliberate — we operate at competitive margins to drive volume and build long-term relationships, not to cut corners. Lower price does not mean lower quality here. Every product is tested to the same standard regardless of price point.
What payment methods do you accept?
We accept Venmo (@sequencelabs), Zelle, Cash App, Bitcoin (on request), and Wire/ACH for larger wholesale orders. Contact us to discuss the best method for your order size.
Ready to place your first order?
Browse the full catalog or reach out directly — we're here to answer questions and get your research back on track.