Pure Chain Aminos vs Science.bio (Closed): Vendor Comparison and Migration Guide
Last updated: May 2026. A practical guide for former Science.bio customers re-sourcing research peptides after the January 27, 2026 voluntary closure.
Why this guide exists
Science.bio voluntarily shut down on January 27, 2026, citing regulatory compliance (source: OptimalHRT). For research customers who relied on Science.bio specifically because of its documentation discipline and clean-label catalog, the question is who can match that bar going forward without exiting the market themselves.
This page answers that question for the migration to Pure Chain Aminos.
WELCOME20 — 20% off your first PCA order, $75 minimum. Shop now.
Side-by-side comparison
| Criterion | Science.bio (closed) | Pure Chain Aminos |
|---|---|---|
| Storefront status | Offline since Jan 27, 2026 | Live, accepting orders |
| Closure type | Voluntary, planned wind-down | N/A — operating |
| Fulfillment | N/A — closed | US-based, in-stock SKUs |
| COA per lot | Was offered; archive offline | Yes — linked on every product page |
| Inventory model | N/A | Domestic in-stock for top SKUs |
| BPC-157 10mg | Was carried | $59.99 |
| BPC-157 15mg | Was carried | $89.99 |
| TB-500 10mg | Was carried | $79.99 |
| NAD+ 500mg / 1000mg | Was carried | $79.99 / $99.99 |
| MOTS-C 40mg | Was carried | $139.99 |
| GLP-receptor research compounds | Was carried | GLP3-R 10mg $149.99 · 20mg $224.99 · GLP2-T 30mg $119.99 |
| GH-secretagogues | Was carried | Ipamorelin 5mg $49.99 · Tesamorelin 10mg $89.99 |
| Nootropics | Was carried | Semax 10mg $64.99 · Selank 10mg $64.99 |
| Mitochondrial | Was carried | SS-31 50mg $154.99 |
| First-order discount | N/A | WELCOME20 — 20% off, $75 min |
Three-step migration walkthrough
Step 1: Inventory what you actually reorder
Open your inbox and search “Science.bio order”. Pull the last 6 months of confirmation emails and list out the SKUs and dosages. The goal is to migrate the SKUs you actually buy, not the broader catalog you browsed.
Step 2: Match each SKU to PCA equivalents
Use the comparison table above. Most former Science.bio customers find direct matches across BPC-157, TB-500, NAD+, MOTS-C, the GH-secretagogue family, the GLP-receptor research family, the nootropic line, and the mitochondrial line. Two PCA-specific notes:
- NAD+ pricing tiers. PCA carries both 500mg and 1000mg; the 1000mg has a lower per-mg cost.
- BPC-157 pricing tiers. PCA carries both 10mg and 15mg vials.
Step 3: Place the first order with WELCOME20
Build a cart of $75+ to qualify. WELCOME20 then drops 20% off the subtotal. Save the COA PDF from each product page when your order ships.
Reorder cadence in a consolidated market
With both Amino Asylum and Science.bio out of the market in a seven-month span, the practical argument for stocking 60-90 days of supply rather than 30 has gotten stronger. PCA’s catalog is in-stock and WELCOME20 is first-order-only — the math leans toward consolidating your first order rather than splitting it.
What to save from your old vendor
- Order confirmation emails — for SKU/dose history
- Any COA PDFs you previously downloaded — once a vendor’s site is offline, the COA archive is gone
- Refund confirmations from the wind-down — for your records
- Credit card statements — verify any subscription/autoship has actually stopped charging
Background reading
Compound-level background: BPC-157 · TB-500 · GLP-3 Receptor · GLP-2-T · NAD+ · MOTS-C · Retatrutide. Workflow: Bacteriostatic water reconstitution guide.
See also
- Science.bio Shut Down: What Researchers Need to Know (January 2026)
- What Happened to Science.bio? Background on the January 2026 Closure
- Science.bio Coupon Codes (No Longer Active) — Use This Instead
Frequently asked questions
How long does PCA shipping take?
US-based fulfillment with standard domestic shipping. Order cutoff times and delivery windows are listed at checkout and on the shipping policy page.
Does PCA carry every SKU Science.bio carried?
PCA carries the high-volume reorder SKUs across the major peptide and nootropic categories: BPC-157, TB-500, NAD+, MOTS-C, the GH-secretagogue family, the GLP-receptor research family, the SS-31 mitochondrial line, and the Semax/Selank nootropic pair. The PCA catalog is not a one-to-one mirror of Science.bio’s prior catalog — niche or low-volume SKUs may not be present.
How does PCA pricing compare to what I was paying at Science.bio?
Pricing varies by SKU. PCA tends to be competitive on the high-volume SKUs and offers tier pricing on NAD+ (500mg vs 1000mg) and BPC-157 (10mg vs 15mg) where the larger size lowers the per-mg cost. Apply WELCOME20 to your first order for an additional 20% off.
Are PCA COAs from a US lab?
Yes. Third-party HPLC purity testing is performed by a US-based independent lab. Results are published as a PDF on the product page for the lot in stock.
What is PCA’s refund policy?
The full refund and reshipment policy is linked from the site footer. Read it before placing your first order so the terms are clear up front.
A note on the broader market
Two of the most-recommended research peptide vendors exited the market in a seven-month window (Amino Asylum June 2025, Science.bio January 2026). The vendors that remain are those operating in the research-only product class with US-based fulfillment and per-lot documentation. PCA is built on those operational patterns specifically because they correlate with longevity \— not as a marketing claim but as a structural choice about how to run a research peptide business.
Sources cited: OptimalHRT — https://optimalhrt.com/science-bio-closed-2026-best-alternative/.
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.
