(best bulk rate)
(Peptide Partners)
(always free)
USA · EU · UK · AU · CA
Full Supplier Comparison
The table below compares the leading research-grade Retatrutide suppliers on the metrics that matter most: price per milligram, domestic availability, shipping cost, COA documentation, and product range. Prices sourced directly from supplier websites, November 2025.
| Supplier | Price / mg | 10mg Kit Price | Domestic? | Free Shipping | COA | Vial Sizes |
|---|---|---|---|---|---|---|
QSC Peptides ✓ Best Valueqscpeptide.com / shopreta.com |
$0.76–$2.30/mg | $230 (100mg) | ✓ USA·EU·UK·AU·CA | ✓ Always | ✓ Every order | 5mg–100mg · 9 sizes |
Peptide Partnerspeptide.partners |
$3.50–$5.70/mg | ~$350–$500 (100mg equiv) | ✗ International only | ✗ Shipping fees | ✓ Yes | 24mg vials only |
PureRawzpurerawz.co |
~$14.40/mg | ~$144 (10mg only) | ~ USA only | ✗ Fees apply | ~ Third-party | 10mg–15mg |
KiloBiokilobio.com |
$11.98–$28.90/mg | ~$289 (10mg) | ✗ No domestic | ✗ No | ~ Yes (claims) | 1mg–50mg |
Bluum Peptidesbluumpeptides.com |
~$8–$12/mg (est.) | ~$120+ (10mg est.) | ~ USA only | ✗ No | ✓ Yes | 10mg, 15mg, 30mg, 60mg |
Particle Peptidesparticlepeptides.com |
~$6–$10/mg (est.) | ~$90–$100 (10mg) | ✗ EU-based, int'l ship | ✗ No | ✓ Yes | 10mg, 20mg |
Peptide Sciences⚠ Permanently closed 2025 |
N/A — Shut down | N/A | ✗ Closed | ✗ Closed | ✗ Closed | Was: 6mg, 12mg, 16mg |
Prices sourced from supplier websites, November–December 2025. Per-mg costs calculated from listed kit prices. Competitor prices subject to change. QSC pricing from qscpeptide.com/qsc-price-list.
QSC Retatrutide — Price Per mg Breakdown
QSC's per-milligram cost drops significantly as you move to larger kits — here's the full breakdown showing how much you pay per mg at each quantity level:
The Hidden Cost: Shipping
When comparing Retatrutide prices across suppliers, shipping is a factor that dramatically changes the real cost — particularly for researchers outside the US who face international shipping fees, customs duties, and long transit times.
QSC Peptides offers free shipping on all orders, always — with no minimum order threshold. What you see is what you pay. This includes domestic delivery within the USA (via USPS/FedEx), EU, UK, Australia, and Canada from their respective regional warehouses. There are no shipping calculation surprises at checkout.
In contrast, most competitors either charge flat shipping fees ($15–$40 for domestic US), offer free shipping only above high minimum order thresholds ($200+), or charge international rates when their products are only stocked in one country.
| Supplier | US Shipping | EU Shipping | AU/CA Shipping | Shipping Notes |
|---|---|---|---|---|
QSC Peptides |
✓ Free, domestic | ✓ Free, domestic | ✓ Free, domestic | Domestic warehouses in all 5 regions. Always free, no minimum. |
Peptide Partners |
✗ International | ✗ International | ✗ International | Ships internationally from one location. Customs risk applies. |
PureRawz |
~ $15 flat | ✗ International fees | ✗ International fees | US-only domestic. Free above $150. International rates apply elsewhere. |
KiloBio |
✗ No domestic | ✗ No domestic | ✗ No domestic | No domestic warehouses confirmed. International shipments only. |
Beyond Price — What Actually Matters
Price per milligram is the most obvious comparison metric, but several other factors determine the true value of a Retatrutide purchase for research purposes:
≥99% Purity — The Non-Negotiable
A cheaper price per mg means nothing if the peptide is 85% pure. QSC guarantees ≥99% HPLC-verified purity on every Retatrutide product — a standard that not all competitors can match. Underdosed or impure Retatrutide produces unreliable research data.
COA on Every Order
A Certificate of Analysis should accompany every shipment — not just be "available on request." QSC provides batch-specific COAs with every order, showing the HPLC purity test results tied to your specific batch number.
True Domestic Fulfillment
Some suppliers claim "domestic" but actually ship internationally. QSC maintains genuine physical inventory in 5 countries. For US researchers, this means 2–5 day USPS/FedEx delivery. For EU/UK/AU/CA, local fulfillment with no customs exposure.
Kit Size Flexibility
QSC offers 9 vial concentrations (5mg to 100mg) in both 10-vial and 20-vial configurations — more options than any other supplier. Whether you need a 50mg starter kit or 1,200mg for extended research, QSC has a kit that matches your exact requirements.
Red Flags That Reveal "Cheaper" Isn't Better
The Retatrutide market has seen a surge of suppliers since the 2023 NEJM trial results. Not all are legitimate. Here are specific red flags to avoid:
- Prices below $1.50/mg at 10mg quantities: Retatrutide is a 39-amino-acid peptide with a complex fatty acid conjugation. Raw material costs alone make pricing below $1.50/mg at small quantities almost certainly indicative of underdosing, incorrect peptide identity, or very low purity.
- "Special sale" Retatrutide at $99: Based on manufacturing cost audits, raw materials for 10mg of Retatrutide alone cost approximately $185. Any price below this is a mathematical impossibility unless the product is mislabeled.
- No batch-specific COA: Generic or non-dated COAs, or COAs that don't reference your specific batch number, cannot be trusted. Legitimate suppliers tie their testing documentation to individual production batches.
- Photoshopped or template COAs: A 2025 review found that a significant portion of "third-party tested" COAs circulating on discount sites were fabricated. Always verify COAs by cross-referencing with the testing laboratory's published records if possible.
- Suppliers with no contact information: Quality suppliers have real phone numbers, email support, and response times measured in hours, not days.
QSC Peptides' transparent pricing is publicly published at qscpeptide.com/qsc-price-list — no negotiation, no hidden fees. If you receive a quote "below market" from an unknown supplier, that gap in pricing almost always reflects a gap in quality.
Verdict — QSC Is the Clear Value Leader
Across every metric that matters for research procurement — price per milligram, domestic availability, free shipping, COA quality, and product range — QSC Peptides delivers the strongest combination of value and quality in the Retatrutide market.
At $0.76–$2.30 per mg depending on kit size, QSC is dramatically cheaper than major competitors. Combined with genuine domestic warehouses in 5 countries, ≥99% purity, batch-specific COAs, and the widest product range available (9 concentrations, 16+ SKUs), QSC represents not just the cheapest option but the best overall option for Retatrutide research procurement.