Vendor and compound
Retatrutide from Koi Peptides
Koi Peptides lists Retatrutide at $9.00 per mg, 22% over the $7.40 peer median. No third-party certificate for Retatrutide from Koi Peptides has been located, so nothing here establishes what is in the vial. The cheapest listed price for Retatrutide anywhere in the index is $2.90 per mg at ZC Labs.
All Retatrutide vendors · Koi Peptides profile · scores 75.1 of 100, rank 12 · 0 certificates for this compound · verified 28 Sept 2026
What it costs
| Vial | Listed price | Per mg | vs peer median | Listing |
|---|---|---|---|---|
| 10 mg | $89.95 | $9.00 | +22% | GLP 3 (Reta) |
Read from the vendor’s own store and normalised per milligram, because a smaller vial at a lower sticker price is usually the dearer peptide.
What the laboratory found
No third-party certificate for Retatrutide from Koi Peptides has been located.
That is a statement about the public record, not an accusation. The vendor may test and not publish, or publish somewhere we have not read. What it means for a buyer is that the price above is the only thing established here, and price says nothing about what is in the vial.
Vendors whose certificates you can check yourself lists the ones where that gap is closed.
Other vendors selling Retatrutide
| Vendor | Score | Per mg | Certificates for this compound |
|---|---|---|---|
| Origin Labs | 89.1 | — | 5 |
| Next Gen Peptides | 87.7 | $4.00 | 16 |
| ZC Labs | 87.2 | $2.90 | 5 |
| Amino Club | 86.1 | $7.00 | 3 |
| Bench Grade Peptides | 79.4 | $3.90 | 4 |
| Hydro Research Peptides | 78.7 | — | 1 |
| Stealth Research Labs | 78.1 | $7.00 | 1 |
| One Aminos | 78 | $7.00 | 2 |
Ordered by overall evidence score. See every vendor listing Retatrutide.
Questions
Is Retatrutide from Koi Peptides third-party tested?
Not so far as this index can establish. No third-party certificate for Retatrutide from Koi Peptides has been located. The vendor may test and not publish; what can be said is that nothing public establishes the contents of a vial.
How much does Retatrutide cost at Koi Peptides?
$9.00 per milligram, from 10 mg at $89.95. The peer median across every vendor we price for Retatrutide is $7.40 per mg, so this is +22% against the market. Prices are normalised per milligram so vials of different sizes compare fairly.
Is Koi Peptides a good place to buy Retatrutide?
Koi Peptides scores 75.1 of 100 on the published rubric and ranks 12 overall, computed from its documentation rather than from opinion. For Retatrutide specifically no certificate is on file, which is the gap to weigh. ZC Labs lists it cheaper at $2.90 per mg.