Our Purity, Customs & Arrival Guarantees

Written by NorthPeptide Research Team

For laboratory and research use only. Not for human consumption.

We Stand Behind Every Order

Buying research peptides online requires trust. You are spending real money on compounds that need to be exactly what the label says. You need them to actually arrive. And if something goes wrong, you need a company that makes it right.

That is why NorthPeptide offers three guarantees on every single order. No fine print. No exceptions.

The 99% Purity Guarantee

Every peptide we sell is tested to confirm at least 99% purity. This is not a marketing claim — it is a verified, measurable standard.

How We Test

We use HPLC testing (High-Performance Liquid Chromatography). This is the gold standard for measuring peptide purity. It works by separating the peptide from any impurities — shortened sequences, oxidized forms, leftover chemicals from synthesis — and measuring exactly how much of the sample is pure product.

Every batch is tested by independent, third-party laboratories. We do not test our own products and call it a day. An outside lab verifies the results, and those results are documented in a Certificate of Analysis (COA) that ships with your order.

What the COA Includes

• Compound name and peptide sequence
• Batch number (so you can trace it)
• HPLC chromatogram (the actual test graph)
• Mass spectrometry data (confirms molecular identity)
• Purity percentage
• Test date and lab information

Our Promise

If any peptide you receive from NorthPeptide tests below 99% purity, we will give you a full refund. No questions asked. We are that confident in what we sell.

Why 99% Matters

Many vendors advertise “high purity” without putting a number on it. Others claim 95% or 98%. The difference matters more than you might think.

At 95% purity, 5% of what you are working with is not the peptide you ordered. That 5% could be truncated sequences, synthesis byproducts, or degradation products. In research, those impurities can change your results. They can cause unexpected reactions. They make experiments harder to reproduce.

At 99%+, you are working with a clean compound. Your research results reflect the peptide itself, not contaminants.

The Customs Guarantee

We ship internationally. That means packages cross borders, go through customs, and sometimes get held up. It is a reality of international commerce.

Here is our policy: if your order is seized by customs, we reship it for free.

You do not pay twice. You do not eat the cost. You contact us, we confirm the seizure, and we send a replacement shipment at no charge.

How It Works

1. Your package is seized or confiscated by customs authorities
2. You receive a seizure notice or your tracking shows the package was held
3. You email us at support@northpeptide.com with your order number and any documentation
4. We verify the situation and ship a replacement, typically within 48 hours

We do this because we know our products are legitimate research compounds. We package carefully and ship with proper documentation. But customs authorities make their own decisions, and we do not think you should pay the price for that.

The Arrival Guarantee

Research peptides need to arrive in proper condition. They are sensitive compounds. If something goes wrong during shipping — a broken vial, damaged packaging, a product that clearly was not stored correctly — we replace it.

Damaged or defective on arrival = free replacement. Period.

What Is Covered

• Broken or cracked vials
• Visibly degraded product (unusual color, cloudiness, or contamination)
• Wrong product shipped
• Missing items from your order
• Packaging damage that may have compromised the product

How to Make a Claim

1. Take a photo of the damaged item and packaging
2. Email support@northpeptide.com with your order number and photos
3. We review your claim (usually within 24 hours)
4. We ship the replacement at no charge

That is it. We do not make you jump through hoops. We do not ask you to ship the damaged product back at your expense. We just fix it.

Why We Offer These Guarantees

This is simple: we are confident in what we sell.

We source from verified manufacturers. We test every batch through independent labs. We use proper packaging and reliable shipping methods. When you do things right on the front end, guarantees on the back end are easy to offer.

Too many peptide vendors hide behind vague policies and make it hard to get help when something goes wrong. We think that is a bad way to do business. If you are trusting us with your research, the least we can do is stand behind our product.

Our Testing Process: Start to Finish

Here is exactly what happens before a peptide reaches your lab:

1. Sourcing — We work with established synthesis facilities that follow Good Manufacturing Practices (GMP). We do not buy from random suppliers to save a few dollars.
2. In-house quality check — Every shipment we receive is inspected for proper packaging, labeling, and storage conditions.
3. Third-party HPLC testing — Independent laboratories run HPLC analysis on every batch. If a batch falls below 99% purity, it does not go on our shelves. No exceptions.
4. Mass spectrometry verification — In addition to purity testing, we confirm molecular identity using mass spectrometry. This ensures the peptide is actually what we say it is — not just pure, but the correct compound.
5. COA generation — The test results are compiled into a Certificate of Analysis. This document travels with your order.
6. Proper storage — Peptides are stored under appropriate conditions until they ship. Temperature-sensitive compounds get the care they need.
7. Careful packaging — Orders are packed to protect against damage during transit. Vials are cushioned. Temperature-sensitive items are shipped accordingly.

What Researchers Say

The reason we can offer these guarantees is that we rarely need to use them. Our return and reship rate is extremely low because we invest in quality at every step. When researchers order from NorthPeptide, they get exactly what they expect: the right compound, at the right purity, delivered intact.

That is the standard every peptide vendor should meet. We just happen to put it in writing.

Ready to Order?

Browse our full catalog of research-grade peptides, all backed by our triple guarantee:

Popular products: BPC-157 | Retatrutide | Tirzepatide | Semaglutide | TB-500 | GHK-Cu

Questions? Email us at support@northpeptide.com.

Summary of Key Research References

Study	Year	Key Finding
Bachem — Quality Control of Amino Acids & Peptides	2024	HPLC combined with mass spectrometry is the gold standard for peptide purity assessment
GenScript — Recommended Peptide Purity Guidelines	2024	95%+ purity is the minimum for research-grade; 99%+ preferred for publication-quality work
Resolve Mass — Peptide Characterization by RP-HPLC	2025	Impurities at even 1-5% levels can alter biological activity and skew experimental results

For laboratory and research use only. Not for human consumption.