Precision. Transparency.
Strength through science.
Third-party tested compounds for advanced research. Pharmaceutical-grade purity, complete transparency, and verified results, batch after batch.
Research Use Only • Not for Human Consumption
- ✓Third-party HPLC verified
- ✓≥99% purity, every batch
- ✓Cold-chain dispatch in 24h
on file
Best Sellers · Lab Verified This Month
Pharma-grade lyophilized compounds. Pick a dose, and every vial ships sealed with its batch COA.
Tirzepatide
Third-party tested · ≥99% HPLC purity · per-batch COA. Research use only.
Ships in <24h
Retatrutide
Third-party tested · ≥99% by HPLC · per-batch COA. Research use only.
Ships in <24h
BPC-157
Third-party tested · ≥99% by HPLC · per-batch COA. Research use only.
Ships in <24h
TB-500 (TB4)
Research-grade Thymosin Beta-4 (TB4) peptide · third-party tested · COA available.
Ships in <24h
GHK-Cu
Copper tripeptide (Gly-His-Lys) · third-party tested · ≥99% HPLC · COA available. Research use only.
Ships in <24h
NAD+
Research-grade NAD+ · third-party tested · ≥99% by HPLC · COA available
Ships in <24h
Proof before potency.
- 01SynthesizedProduced to spec in cGMP-aligned facilities.
- 023rd-party HPLCIndependent labs assay identity and purity.
- 03COA publishedEvery batch's certificate is posted on file.
- 04Cold-chain dispatchSealed, tracked, and shipped within 24h.
- 05Your research, our priorityAlways available and typically replies within minutes. 9AM–9PM EST, 7 days a week.
Certificate of Analysis
Retatrutide · 30mg
- Batch
- SL-RETA-30
- Assay (HPLC)
- 99.4%
- Sterility
- PASS
- Endotoxin
- < 0.5 EU/mg
Research Use Only • Not for Human Consumption
5.0 / 5 · 1,000+ reviews
“Documentation is immaculate. The COA matched the batch ID on the vial exactly.”
“Fast dispatch and the cold-chain packaging arrived intact. Reordering.”
“The transparency is why I switched. Assay numbers are right there.”
Why Researchers Choose Sparta Labs
Sparta Labs supplies research-grade peptides for laboratory and research use only. The difference between suppliers in this space is not the molecule on the label, but whether you can independently verify what is in the vial. Every Sparta Labs compound ships with a batch-specific Certificate of Analysis (COA) from an independent laboratory, so the identity and purity of the exact lot you receive are documented, not assumed.
Our standard is third-party HPLC testing on every batch, a published COA you can match to the batch ID printed on your vial, and cold-chain handling so lyophilized material arrives as intended. We are a US-based operation with US support hours, and every order is backed by a 30-day lab-verified guarantee: if the COA does not match your batch, or purity falls below 99%, we refund or replace it.
| Standard | Sparta Labs | Untested suppliers |
|---|---|---|
| Third-party HPLC testing | Every batch | Rarely / unverified |
| Batch-specific COA | Included, matched to vial | Generic or none |
| Purity standard | ≥99% | Not stated |
| Cold-chain shipping | Standard | Varies |
| US-based support | 9AM–9PM EST, 7 days | Often none |
| Guarantee | 30-day refund or replace | None |
Understanding Peptide Purity & Testing
Purity, in a research context, describes how much of a sample is the target compound versus process-related impurities. It is an analytical measurement, not a quality slogan. The most common method for assessing peptide purity is High-Performance Liquid Chromatography (HPLC), which separates the components of a sample and reports the target peptide as a percentage of the total. For example, a 99.4% HPLC assay.
A Certificate of Analysis (COA) is the document that records those results for a specific batch. A meaningful COA identifies the batch or lot number, the assay method and result (e.g. HPLC area-percent), and supporting tests such as identity confirmation by mass spectrometry, sterility, and endotoxin where applicable. Because results are batch-specific, a COA is only useful if it corresponds to the lot you actually received, which is why Sparta Labs ties each COA to the batch ID on the vial.
When evaluating any research-grade supplier, the questions worth asking are consistent: Is testing performed by an independent third party? Is the COA specific to the batch shipped, or a generic sample document? Is the assay method stated? Is the material handled and shipped to preserve its stated condition? Documentation that answers these questions is what separates verifiable material from unverifiable material.
Browse published certificates in our Lab Results library, read more in the research library, or view compounds like Tirzepatide, Retatrutide, and BPC-157.
Frequently Asked Questions
How do I verify my batch COA?+
Each order ships with a Certificate of Analysis tied to a batch ID. Match the batch ID on the COA to the batch ID printed on your vial. They should be identical. The COA lists the independent HPLC assay result and supporting tests for that specific lot. You can also browse published COAs in our Lab Results library.
What does “Research Use Only” mean?+
Research Use Only (RUO) means these compounds are sold strictly for laboratory and research purposes. They are not drugs, dietary supplements, or consumer products, and nothing on this site is a statement of safety or efficacy. They are not for human or veterinary use.
What purity standard do you hold?+
Our standard is ≥99% purity by third-party HPLC, documented per batch on the COA. If a batch you receive does not meet that standard, our 30-day guarantee covers a refund or replacement.
How are orders shipped, and where?+
We are US-based and ship within the United States. Lyophilized material is dispatched with cold-chain handling, sealed and tamper-evident, typically within 24 hours of a confirmed order.
How should research material be stored?+
General handling guidance for lyophilized research peptides is to keep vials sealed and cold, away from light and moisture, until used in the laboratory. Specific storage conditions for a given compound are noted on its documentation.
What is your guarantee?+
Every order is backed by a 30-day lab-verified guarantee. If the COA does not match the batch on your vial, or purity is below 99%, we will refund or replace your batch.
Lab-Verified or Your Money Back · 30 Days
If the COA doesn’t match the batch on your vial, or purity is below 99%, we’ll refund or replace your batch, no questions asked.
- ✓ Batch-matched COA on every order
- ✓ Independent HPLC verification
- ✓ 30-day refund-or-replace