Looking for a Peptide Sciences Alternative? Start Here.
Looking for a Peptide Sciences Alternative? Start Here.
Improved Peptides carries the same compound lineup with the same standards Peptide Sciences customers expected — HPLC-tested 99%+ purity, third-party COAs on every batch, US fulfillment, and same-day shipping. No subscription. No upcharge. No registration friction.
- HPLC 99%+ Verified
- Third-Party COAs
- US-Based Fulfillment
- Free Shipping $150+
TL;DR. This page helps former Peptide Sciences customers compare research peptide suppliers by catalog coverage, COA access, testing standards, fulfillment, and research-use compliance. Improved Peptides is an independent supplier and is not affiliated with Peptide Sciences.
Why Peptide Sciences customers are switching
On March 6, 2026, Peptide Sciences ceased operations. Their existing customers — researchers, labs, and individuals studying compounds like BPC-157, TB-500, GLP-1 agonists, and GHK-Cu — were left without a fulfillment source.
If you’re reading this, you’re likely:
- Mid-research with an active protocol that requires consistent supply
- Looking for parity on purity, sequence verification, and lab documentation
- Checking the new vendor’s standards before placing the first order
- Wary of low-trust affiliate sites that surfaced after the shutdown
You’re in the right place.
Direct comparison: Peptide Sciences vs Improved Peptides
| Standard | Peptide Sciences (pre-shutdown) | Improved Peptides |
|---|---|---|
| Purity standard | 99%+ HPLC | 99%+ HPLC ✓ |
| Sequence verification | Mass spectrometry | Mass spectrometry ✓ |
| Concentration verification | UV spectroscopy | UV spectroscopy ✓ |
| Third-party COAs | Yes, batch-traceable | Yes, batch-traceable + public COA Library ✓ |
| Lyophilization | Standard | Standard ✓ |
| US fulfillment | Yes | Yes — same-day before 2pm ET ✓ |
| Free shipping threshold | ~$200 | $150 ✓ (lower) |
| Compound range | ~50 compounds | 20+ active SKUs, expanding monthly |
| COA accessibility | Login required | Public — no account needed ✓ |
| Research-use disclaimer | Yes | Yes — clearly disclosed ✓ |
Bottom line: Same purity standards. Lower free-shipping threshold. Public COAs without account walls.
Compound parity: what’s stocked
Improved Peptides currently carries the most-frequently-ordered compounds from the former Peptide Sciences catalog. Direct cross-reference:
Tissue repair / recovery
- BPC-157 — frequently studied alongside TB-500 as the Wolverine Stack
- TB-500 (Thymosin Beta-4)
- GHK-Cu (Copper Peptide)
GLP-1 / metabolic
Growth hormone secretagogues
Cognition / nootropic
Longevity / mitochondrial
Pigmentation / sexual response
Reconstitution
Don’t see a compound you used to source? Email research@improvedpeptides.com — if there’s enough demand, we add it to the next manufacturing run.
How our quality standards work
Every batch ships only after passing three independent verification stages:
- HPLC purity test — High-performance liquid chromatography, 99%+ purity threshold
- Mass spectrometry sequence confirmation — molecular weight verification matches expected peptide sequence
- UV spectroscopy — concentration verification against reference standards
The COA from the third-party lab — including lab name, lot number, and full chromatograms — is published in our COA Library and linked from every product page before you order. No account required.
Migration guidance for former Peptide Sciences customers
If you maintained an account, ordering protocol, or research log with Peptide Sciences, here’s how to transition cleanly:
Step 1 — Match your compounds. Use the parity table above. SKU names match the standard nomenclature.
Step 2 — Verify the COA before ordering. Click the COA link on the product page. Check:
- Compound name and sequence
- Purity ≥ 99%
- Batch/lot number matches what’s currently shipping
- Test date is recent
Step 3 — Place a small first order. We recommend a single-vial test order to verify shipping speed, packaging integrity, and lot consistency before committing to bulk.
Step 4 — Cross-reference your protocol. Storage, reconstitution, and stability characteristics are listed on every research page. See /research/[compound]/ for citation-backed mechanism notes.
Step 5 — Bulk order with confidence. Free shipping above $150. Same-day fulfillment before 2pm ET. Tracking emailed when label is generated.
FAQ — former Peptide Sciences customer concerns
Is Improved Peptides affiliated with Peptide Sciences?
No. Improved Peptides is an independent US-based research peptide supplier. We have no corporate, ownership, or operational relationship with Peptide Sciences.
Are your peptides sourced from the same manufacturer Peptide Sciences used?
We do not disclose specific manufacturing partners, but every batch is independently HPLC-tested and sequence-verified before it ships. The COA is what matters — not the factory name. Read the COA before you order.
How do your prices compare?
Pricing varies by compound. Most SKUs are within ±10% of historical Peptide Sciences pricing. Free shipping kicks in at $150 (vs ~$200 at Peptide Sciences), which materially reduces total cost on smaller orders.
Do you require an account to view COAs?
No. The full COA Library is publicly browsable. Every COA is linked directly from the product page. We believe lab documentation should be available to researchers before purchase, not after.
How fast is shipping?
Orders placed before 2pm ET on business days ship the same day. Standard US shipping arrives in 2-5 business days; expedited and overnight options are available at checkout.
What if my package is damaged or doesn’t arrive?
Damaged or non-delivered shipments are reshipped at no charge once verified. Contact research@improvedpeptides.com within 7 days of expected delivery.
Are these peptides legal to purchase?
All compounds are sold strictly for in vitro and laboratory research use. They are not intended for human consumption, diagnosis, or treatment. By purchasing, the buyer affirms research-only intent.
Can I bulk-import a list of compounds I used to order from Peptide Sciences?
Yes. Email research@improvedpeptides.com with your compound list — we’ll cross-reference SKU availability and send back a parity report within 1 business day.
Source the compounds you trusted, with the documentation you actually need.
Every batch HPLC-tested. Every COA published. Every order shipped same-day before 2pm ET. Free shipping over $150.