Pure Chain Aminos vs Peptide Sciences (Closed): Vendor Comparison and Migration Guide
Migrating Your Research Program From Peptide Sciences
Peptide Sciences ceased operations on March 6, 2026. For researchers whose programs depended on their catalog, the question is no longer whether to migrate, but where to and how. This page is a structured migration guide. It compares Pure Chain Aminos against Peptide Sciences across the criteria research customers actually weigh, then walks through a three-step migration process to move a program with minimum disruption.
For background reading, see our companion pages on the closure itself, the contributing factors and timeline, and the replacement coupon for displaced customers.
Side-by-Side Vendor Comparison
| Criterion | Peptide Sciences (Closed March 2026) | Pure Chain Aminos |
|---|---|---|
| Operational status | Closed; storefront non-functional | Active; daily order processing |
| Certificate of Analysis | HPLC and mass spec when active | HPLC and mass spec on catalog |
| Batch documentation | Was provided | Lot-traceable |
| Shipping origin | United States | United States |
| Catalog size | ~80 SKUs at peak | 43 SKUs covering high-demand targets |
| Ordering experience | Web checkout (now offline) | Active web checkout |
| Payment processing | Stalled in final weeks | Stable processor |
| New-customer pricing | None redeemable | WELCOME20: 20% off $75+ |
| Support response | Inactive | Active |
| Successor brand? | None announced | N/A |
Catalog Mapping
Most former Peptide Sciences researchers are reordering inside a small set of high-demand targets. Here is the mapping our reorder data shows is most common:
- BPC-157 single — BPC-157 15mg or BPC-157 10mg.
- TB-500 single — TB-500 10mg.
- BPC-157 + TB-500 combo — the bundled BPC-157 / TB-500 10mg.
- GLP-3 receptor work — GLP3-R 20mg or GLP3-R 10mg.
- Metabolic research — MOTS-c 40mg.
- Growth hormone secretagogue research — Tesamorelin 10mg, Tesamorelin 11mg with Ipamorelin 6mg, Ipamorelin 5mg.
- NAD+ research — NAD+ 1000mg or NAD+ 500mg.
Background research pages: BPC-157, TB-500, GLP-3 receptor, MOTS-c, NAD+.
Three-Step Migration Walkthrough
Step 1: Inventory Your Existing Program
List the compounds, doses, and quantities you previously ordered from Peptide Sciences. Do this from your own records first, since their support is no longer reachable for order history retrieval. Note any reconstitution preferences (carrier volume, vial size) so the replacement order matches your existing protocols.
Step 2: Map to the PCA Catalog
Walk through the catalog mapping above. Where Peptide Sciences offered a SKU at one mg dose and Pure Chain Aminos offers a slightly different mg, this is rarely a problem — researchers typically adjust reconstitution to match their working solution rather than constraining vial size. The 43-SKU PCA catalog covers the high-demand surface area of what most former Peptide Sciences customers were buying. If a niche compound is missing, contact PCA support and we can confirm whether it is on the roadmap.
Step 3: Place the First Migration Order with WELCOME20
Add at least $75 of mapped products to your cart, paste WELCOME20 at checkout for 20% off, and complete the order. Save your COA documents alongside any remaining Peptide Sciences COAs you have on file so you maintain end-to-end documentation continuity for your research records.
Coupon
WELCOME20 — 20% off any order of $75 or more. One use per customer.
Read Next
- Peptide Sciences Shut Down: What Researchers Need to Know
- What Happened to Peptide Sciences: Full Background
- Peptide Sciences Coupon (No Longer Active) — Use This Instead
- Browse the full Pure Chain Aminos catalog
Open the catalog and apply WELCOME20 at checkout »
Detailed Side-by-Side Comparison (Extended)
The summary table above covers the headline differences. The extended capability table below adds the operational dimensions that matter most to researchers running multi-month programs, where small day-to-day frictions add up faster than headline pricing.
| Capability | Peptide Sciences (closed March 2026) | Pure Chain Aminos |
|---|---|---|
| Per-lot COA availability | Was provided on request | Per-lot COA available; HPLC purity, mass spec confirmation |
| Endotoxin / sterility data | Was provided on selected SKUs | Available on sterile-filtered SKUs |
| Cold-chain shipping | Standard on temperature-sensitive sequences | Cold-chain on temperature-sensitive sequences |
| Order tracking visibility | Customer dashboard (offline since closure) | Live tracking with carrier updates |
| Reorder workflow | Repeat-order from history (offline) | Reorder via account history |
| Bacteriostatic water bundling | Sold separately | BAC water available alongside catalog |
| Catalog refresh cadence | Slowed in final months | Active SKU additions across categories |
| Documentation for compliance recordkeeping | Receipts, COAs, lot numbers | Receipts, COAs, lot numbers, order email archive |
| Support channel | Web ticket (offline) | Email and on-site contact form |
| Public closure or operational risk indicators | Closed | Active operations as of current date |
| Continuity of supply for healing class | None going forward | BPC-157 10mg, 15mg; TB-500 10mg; combination blends |
| Continuity of supply for GLP class | None going forward | GLP3-R 10mg, GLP3-R 20mg, GLP2-T 30mg |
| Continuity of supply for GH-class | None going forward | Tesamorelin 10mg, Ipamorelin 5mg, combo blends |
| Continuity of supply for longevity class | None going forward | NAD+ 1000mg, NAD+ 500mg, SS-31 50mg |
| Continuity of supply for metabolic class | None going forward | MOTS-c 40mg |
Catalog Mapping by Category
Researchers migrating an entire program tend to think in categories rather than individual SKUs. The mapping below groups Pure Chain Aminos products by the research category most former Peptide Sciences customers reordered into. Use it as a starting point for rebuilding a multi-line reorder.
Healing peptides
The largest single category by reorder volume. Most programs centered on BPC-157 alone, TB-500 alone, or the combined blend.
- BPC-157 10mg — standard single-vial size for most healing-class research.
- BPC-157 15mg — higher per-vial mass for extended studies or combined-protocol research.
- TB-500 10mg — standard TB-500 vial.
- BPC-157 / TB-500 10mg combo — single-vial blend for paired-research designs.
GLP-class
Second-largest category by post-closure reorder activity. Pure Chain Aminos covers the GLP-3 receptor and GLP-2-T families.
- GLP3-R 10mg — entry-vial size.
- GLP3-R 20mg — higher-mass vial for extended programs.
- GLP2-T 30mg — gut-axis research target.
Growth-hormone-releasing class
Tesamorelin and Ipamorelin programs. Available individually or as a combination vial.
- Tesamorelin 10mg — standard single-vial size.
- Ipamorelin 5mg — standard Ipamorelin vial.
- Tesamorelin 11mg with Ipamorelin 6mg combo — bundled vial.
Longevity class
NAD+ and SS-31 programs.
- NAD+ 1000mg — standard high-mass vial.
- NAD+ 500mg — smaller vial for shorter programs.
- SS-31 50mg — mitochondrial-research target.
Metabolic and other classes
Smaller-volume but high-priority for the researchers who used them.
- MOTS-c 40mg — metabolic-research target.
Background research notes are available on the BPC-157, TB-500, GLP-3 receptor, GLP-2-T, NAD+, MOTS-c, and retatrutide compound pages. The bacteriostatic water reconstitution guide covers the standard solvent workflow for vials in any of the above categories.
Migration Walkthrough (Extended Step-by-Step)
The three-step framework above is the headline path. The expanded walkthrough below adds the operational details that researchers running multi-line reorders find most useful.
Step 1: Pull a complete prior-vendor inventory.
Before opening any new-vendor catalog, build a single document listing every compound and dose previously ordered from Peptide Sciences, the typical reorder cadence (monthly, quarterly), and the working concentration each compound was reconstituted to. The Peptide Sciences customer portal is offline, so this needs to be assembled from saved order confirmation emails, card-statement line items, and the lab’s own inventory log. Include lot numbers from any saved COAs — useful for documentation continuity even after the supplier changes.
Step 2: Map prior SKUs to the Pure Chain Aminos catalog.
For each line in the inventory, find the closest Pure Chain Aminos equivalent in the category mapping above. In the healing category, mg-for-mg matches are usually direct: BPC-157 10mg maps to BPC-157 10mg, TB-500 10mg maps to TB-500 10mg. In the GLP class, the 10mg vial maps to GLP3-R 10mg. Where a previous vendor offered a slightly different vial size, researchers typically adjust reconstitution to maintain the same working solution rather than changing study design.
Step 3: Stage a single test order.
Place one small order covering the highest-priority compound in the program. The first order is also the right time to apply the WELCOME20 coupon. Inspect the package on arrival: ice-pack condition, vial seal integrity, label clarity, and the included or downloadable COA for the lot number on the vial. Confirm the COA’s purity, mass spec confirmation, and lot identifier match the vial in hand.
Step 4: Reconstitute and validate against existing baseline data.
Use the bacteriostatic water reconstitution guide for the standard solvent workflow. Run the new lot against any baseline measurements the lab already has on the prior vendor’s material. Discrepancies that fall outside expected lot-to-lot variation are the right time to contact support before scaling reorder volume.
Step 5: Place the full reorder and document the migration.
Once the test order has validated, scale to the full reorder volume. Save the order confirmation, COAs, and lot numbers in the same documentation system that held the Peptide Sciences records. End-to-end documentation continuity is what makes the migration auditable months and years later.
Step 6: Set a quarterly vendor health-check.
The Peptide Sciences case is the reason this step exists. Once a quarter, confirm the vendor’s storefront is responsive, an order placed completes within stated lead time, and support replies within the documented window. Three quarters of green checks is a reasonable bar for confidence in continuity.
Extended FAQ
Is Pure Chain Aminos a successor brand to Peptide Sciences?
No. Pure Chain Aminos is an independent vendor. There is no public record of any successor brand being announced by Peptide Sciences, and any claim of one should be treated with skepticism.
Will my saved Peptide Sciences COAs transfer?
Saved COAs document the lots the lab already received and remain part of the research record for those vials. They do not carry over to any new vendor. New vials ship with their own current COAs from Pure Chain Aminos.
How long does shipping typically take?
U.S. domestic delivery on most catalog SKUs is in the standard two-to-four-business-day window once the order is processed. Cold-chain orders may show a slight handling delay to ensure the cold pack is fresh at dispatch.
Can I migrate one line of my program at a time?
Yes. The most common migration pattern is healing-class first (BPC-157 and TB-500), then GLP-class, then GH-class, then longevity. There is no operational requirement to move every line in a single order.
Is the catalog likely to grow?
Pure Chain Aminos adds SKUs across the categories above. If a niche compound is missing today, contact support and we can confirm whether it is on the roadmap. Researchers planning programs more than six months out should treat catalog confirmation as part of the planning step.
What is the pricing posture compared to Peptide Sciences?
Pricing on the broader U.S. research market moved roughly five to twelve percent higher in the weeks following the closure. Pure Chain Aminos pricing sits in the same general band as the surviving market. The WELCOME20 coupon offers 20% off the first order of $75 or more, which materially offsets the broader market shift on the migration order.
What if I need bacteriostatic water alongside the migration order?
Bacteriostatic water is available alongside the catalog. The reconstitution guide covers the standard solvent workflow, including carrier-volume calculations for common vial sizes.
Where can I read the rest of this site’s coverage on the Peptide Sciences closure?
See the companion pages Peptide Sciences shut down, What happened to Peptide Sciences, and Peptide Sciences coupon alternative.
Why Researchers Choose PCA After PS
The migration patterns from Peptide Sciences cluster around a small set of consistent reasons. Each of them maps back to one of the eight evaluation criteria that the surviving market is now built around.
- Continuity. Active operations, daily order processing, and a stable payment processor remove the operational risk that ended the prior vendor.
- Documentation. Per-lot COAs with HPLC purity and mass spec confirmation match the standard the prior vendor set, and exceed it on lot traceability for many SKUs.
- Catalog overlap. The healing, GLP, GH, longevity, and metabolic categories together cover the surface area where most former Peptide Sciences reorders fell.
- U.S. fulfillment. Domestic dispatch removes customs variability and supports cold-chain integrity on temperature-sensitive sequences.
- First-order economics. WELCOME20 takes 20% off the first order of $75 or more, which makes the migration order cost-comparable to the prior vendor’s typical order even before factoring in catalog efficiency.
- Cross-program documentation. Order email archives, COAs, and lot numbers fit the same documentation pattern researchers already used for prior-vendor records, making the migration auditable end-to-end.
Researchers ready to begin can browse the full catalog, jump to a specific category through the product links above, or read the companion closure, background, and coupon pages first.
Research peptides for laboratory use only. Not approved by the FDA. Not for human consumption. By purchasing, you confirm you are a qualified researcher operating in a controlled laboratory setting.
