Vendor and compound
SS-31 from ZC Labs
ZC Labs lists SS-31 at $3.75 per mg, 31% under the $5.40 peer median. 1 third-party certificate for this compound from this vendor is on file, assayed by Freedom Diagnostics Testing, averaging 99.82% purity. The cheapest listed price for SS-31 anywhere in the index is $3.00 per mg at Hydro Research Peptides.
All SS-31 vendors · ZC Labs profile · scores 83.2 of 100, rank 11 · 1 certificate for this compound · verified 18 Aug 2026
What it costs
| Vial | Listed price | Per mg | vs peer median | Listing |
|---|---|---|---|---|
| 10 mg | $37.5 | $3.75 | -31% | SS-31 10mg |
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. Codepepindex· 10% off applies at checkout.
What the laboratory found
| Lot | Assayed | Purity | Label → assayed | Laboratory | Record |
|---|---|---|---|---|---|
| ZCLa2607301116 | 4 Aug 2026 | 99.82% | 50 mg → 55.67 mg | Freedom Diagnostics Testing | Open |
Freedom Diagnostics Testing publishes a lookup, so these reports can be confirmed at the laboratory rather than taken from the vendor. How to check one.
Other vendors selling SS-31
| Vendor | Score | Per mg | Certificates for this compound |
|---|---|---|---|
| Ascend Science | 90.1 | $5.25 | 1 |
| Origin Labs | 87.7 | — | 1 |
| Bench Grade Peptides | 86.8 | $8.00 | 1 |
| Polaris Peptides | 86.6 | $5.16 | 1 |
| Hydro Research Peptides | 86.5 | $3.00 | 0 |
| PeptidePlugs | 86.3 | $4.00 | 6 |
| Koi Peptides | 79.8 | $5.00 | 0 |
| Ascension Peptides | 79 | $8.00 | 1 |
Ordered by overall evidence score. See every vendor listing SS-31.
Questions
Is SS-31 from ZC Labs third-party tested?
Yes. 1 certificate for SS-31 from ZC Labs is on file, signed by Freedom Diagnostics Testing. Each names a lot, prints the assayed mass against the labelled mass, and links to the document it was read from. Freedom Diagnostics Testing also publishes a lookup, so the report can be confirmed at the laboratory rather than taken from the vendor.
How much does SS-31 cost at ZC Labs?
$3.75 per milligram, from 10 mg at $37.5. The peer median across every vendor we price for SS-31 is $5.40 per mg, so this is -31% against the market. Prices are normalised per milligram so vials of different sizes compare fairly.
Is ZC Labs a good place to buy SS-31?
ZC Labs scores 83.2 of 100 on the published rubric and ranks 11 overall, computed from its documentation rather than from opinion. For SS-31 specifically it has 1 certificate on file. Hydro Research Peptides lists it cheaper at $3.00 per mg.