Northline Labs
Grade C is a fair grade. Some proof, some real gaps.
Strong on lab testing and results against our standard. Weak on outside blind tests, testing depth and business transparency.
Facts last checked Sep 30, 2026. Report an error on this listing
Less than a year in business. Under 12 months old. No vendor earns an A in its first year.
What we found
- Accredited outside lab testing
- A report for every batch
- Purity of 99% or higher on its reports
- Vials that match the labeled amount
What holds it back
- No outside blind tests yet
- Under a year in business
- Prices well above the market average
- No identity (mass spec) testing shown
Standout aspects
- Accredited labIts lab has been inspected and certified by an official body.
- 99%+ purityIts reports show 99% purity or better, with no batch under 98%.
- Takes cardsYou can pay by card, so you can dispute a charge with your bank if something goes wrong.
Watch out for
- New sellerIn business less than a year, so there is no track record yet.
57 of 100 points earned
84% verified · High confidenceEach square is one point. Filled squares are points earned, empty squares are points missed, striped squares are not counted yet.
Every check, explained
Tap any area to see each check, what it means, and what we found.
Lab TestingStrong · 100% verified9316% of score
Do they test every batch at a real outside lab, and let you see the reports?
A lab report (a COA, certificate of analysis) is the only paper proof of what is in a vial. We want reports from a named outside lab, for every batch, that are recent and easy to see before you buy.
An outside lab is a testing company the seller does not own. "Accredited" means an official body inspected the lab and certified its accuracy.
What we found: Reports come from ILS Laboratories. At least one of these labs is ISO/IEC 17025 accredited.
A batch (or lot) is one production run. A report for each batch shows the product you would get was tested, not just an old sample.
What we found: Publishes a separate report for each batch.
How many lab reports the seller has published. More reports means more of its products have been checked.
What we found: 49 lab reports on file.
How recent the newest report is. Old reports may not match what is being sold today.
What we found: Newest report we found: Jul 8, 2026.
Whether you can see the lab reports before you buy, without making an account.
What we found: Reports are public, no account needed.
Testing DepthWeak · 100% verified3512% of score
Do their reports cover more than purity?
Purity alone does not tell you a vial is clean or correctly filled. A thorough seller also tests identity, net content, endotoxin, sterility and heavy metals. Each test counts only if it appears on real reports.
How much of the vial is the actual compound. Measured with HPLC, the standard lab method for purity.
What we found: Purity (HPLC) results appear on its reports.
Confirms the vial holds the compound on the label and not something else. Measured with mass spec.
What we found: Identity (mass spec) is not on the reports we reviewed.
How many milligrams are really in the vial compared with what the label says.
What we found: Net content results appear on its reports.
A common kind of contamination left behind by bacteria. Measured with the LAL test. Clean products have very little.
What we found: Endotoxin is not on the reports we reviewed.
Checks that nothing is growing in the product, like bacteria or mold.
What we found: Sterility is not on the reports we reviewed.
Checks for lead, arsenic, cadmium and mercury.
What we found: Heavy metals is not on the reports we reviewed.
Results vs Our StandardStrong · 100% verified998% of score
Do their own results meet a strict, fixed standard?
Having reports is not enough. Every result is held to the same published standard: 99% purity or higher, and net content within 10% of the label.
Our bar is 99% purity or higher, which means no more than 1% of the vial is anything other than the labeled compound.
What we found: Median purity on its reports: 99.4% across 27 reports (lowest 98.31%). Our standard is 99% or higher.
Our bar is within 10% of the label. A 10 mg vial should hold between 9 and 11 mg.
What we found: 26 of 27 reports landed within 10% of the labeled amount. 0 came in more than 10% under and 1 more than 10% over.
Outside Blind TestsWeak · 100% verified3016% of score
When someone else bought it anonymously and had it tested, did it match the label?
A vendor controls which vial it sends to its own lab. Blind tests of products bought at retail by independent testers are the hardest proof to fake. No outside tests means this category starts low.
Someone buys the product anonymously, like a normal customer, and sends it to a lab. The seller cannot pick a "good" vial to send, so this is the hardest proof to fake.
What we found: No outside blind test results on file yet. With no evidence either way, this area starts at 30, not 0, and rises only with real test results.
Report HonestyMostly unchecked so far · 35% verified5810% of score
Can you check the report is real, and match it to the vial you get?
Fake, edited and reused lab reports are the biggest trick in this market. We reward reports you can confirm on the lab's own website and batch numbers printed on the vial.
Whether the lab's own website confirms the report is real. Fake and edited reports are common in this market.
What we found: Not yet checked.
Whether the batch number printed on the vial matches a published report, so you know which report applies to your vial.
What we found: Not yet checked.
Whether older reports stay online. Sellers that delete old reports can hide bad results.
What we found: Keeps older reports online so batches can be compared.
Signs that a report was faked, edited or reused for a different product.
What we found: No report red flags found in our sources.
Track RecordMiddle of the road · 100% verified679% of score
How long have they been around, and is their history clean?
Vendors that vanish take your money with them. Regulators also shut down sellers who market peptides for human use, so a regulatory warning letter is a real risk to buyers.
How long the business has been around. New sellers have no track record yet.
What we found: Less than a year in business (domain registered).
Whether a government regulator has sent the seller a warning letter in the last two years.
What we found: No regulatory warning letters found.
Documented problems, like orders that never arrived or sudden ownership changes.
What we found: No documented problems found in our sources.
Buyer ProtectionMiddle of the road · 75% verified577% of score
If something goes wrong, can you get your money back?
Credit cards let you dispute a charge. Zelle, crypto, Cash App and bank transfers do not. A written refund policy and a reship guarantee matter too.
Paying by credit or debit card lets you ask your bank to reverse the charge if something goes wrong. Crypto, Zelle and Cash App cannot be reversed.
What we found: Takes cards (Apple Pay, Google Pay), so charges can be disputed.
A promise to send your order again if it gets lost or seized in shipping.
What we found: No reship policy found.
Whether the seller promises, in writing, to give your money back, and how much.
What we found: Not yet checked.
Testing PolicyMiddle of the road · 50% verified654% of score
Do they have a written testing protocol, and do they welcome buyers testing for themselves?
A seller with nothing to hide says exactly what every batch is tested for and where, and welcomes buyers who send vials to their own lab. Sellers that refund or replace a product that fails an outside test earn full points.
A written policy that says what every batch is tested for and which lab does the testing.
What we found: Per-lot testing policy (verified).
Whether the seller welcomes customers sending products to their own lab, and refunds products that fail.
What we found: Not yet checked.
Business TransparencyWeak · 100% verified234% of score
Is it a real company you could find and contact?
Real businesses publish a legal name, a real address and a way to reach them. Mailbox and registered-agent addresses score lower. Being made or finished in the USA earns a small bonus.
The official registered company name, like "Example Labs LLC". Real businesses publish it.
What we found: No legal company name found.
A real street address, not just a mailbox or a registered-agent office.
What we found: Only a city or region published: Plymouth MN.
A phone number and an email address you can actually reach.
What we found: Publishes an email only.
Whether the people behind the store are named.
What we found: No named owner or team found.
Whether products are made or finished in the USA. A small bonus.
What we found: No USA-made or USA-finished claim found.
ShippingMostly unchecked so far · 0% verified404% of score
Does your order ship fast and tracked, with real options, and get replaced if it goes missing?
Speed, tracking, shipping options and what happens when a package goes missing.
How fast orders ship, whether you get tracking, what shipping options exist, and what happens if a package goes missing.
What we found: Not yet checked.
Price CompetitivenessWeak · 100% verified274% of score
How do their prices compare with the market average?
Lower prices are better for buyers. We compare each seller's prices with the market average across a basket of common products. Price is scored on its own, like every other area, and never changes how testing is scored.
We compare the seller's prices with the market average across common products. Cheaper earns more points.
What we found: Prices average 155% of the market average across common products (55% above the market average).
SupportWeak · 50% verified432% of score
Can you reach a person, and do they actually help paying customers?
We count the ways to reach the seller, and we measure how support treats buyers: how fast it answers and whether the problem gets solved, from our own test messages and screened buyer ratings.
How many ways you can reach a person: phone, email or live chat.
What we found: Reachable by email.
How support treats paying customers: how fast it answers and whether the problem gets solved.
What we found: Not yet measured. We send test messages and read screened buyer ratings.
WebsiteStrong · 100% verified1001% of score
Can you see prices, products and reports easily?
Hidden prices and locked catalogs make it harder to compare and check.
Whether you can see prices without making an account.
What we found: Prices are visible without an account.
Whether lab reports are easy to find on the site.
What we found: Reports are easy to reach.
Whether you can browse products without logging in.
What we found: The catalog is open to browse.
Community RatingNeeds 10 screened ratings first--3%
What do verified buyers say, privately?
Reviews are submitted privately and screened for fakes and competitor attacks. Only the positive and negative totals are public. This counts only after 10 screened ratings, and it can never outweigh the proof above.
How the score adds up
How 57 was calculated.
Each area is scored 0 to 100, then multiplied by its share. The three shares add up to the final score.
Community Rating (3%) is not counted yet, so the other checks are scaled up to fill 100%. That is why the shares above differ slightly from the 62 / 24 / 14 split.
A score limit applies (less than a year in business) but the checks already add up below it.
Northline Labs earns a C (57 out of 100) and ranks #23 of 104. It does best on lab testing (93) and results against our standard (99). It loses the most points on outside blind tests (30), testing depth (35) and business transparency (23).
We verified 84% of what we check, so confidence is high. 2 areas are still mostly unchecked (report honesty and shipping); they use a below-middle placeholder until our daily checks confirm the facts.
What would raise the score most
- Get products tested blind by an independent testing program.up to +11.2
- Bring prices closer to the market average.up to +2.9
- Use labs that let buyers confirm reports on the lab’s own website.up to +2.6
Buyer ratings
Not enough ratings yet (0 of 10 needed).
Every review needs a photo of the product label, and a person checks it. Reviews stay private: each one only adds a thumbs up or down to this tally, which counts for 3 of 100 points once there are 10.
Other sites, sources and history
2 other ranking sites rate this seller. Checked Sep 30, 2026.
| Site | Their rating |
|---|---|
| PepIndex | 74.4/100 |
| PeptideBenchmark | C (7.28/10) |
Other sites average: 74/100 · Our score: 57/100. Ours is lower because we give no points for claims without proof.
Sources for this report
- PeptideBenchmarkSep 30, 2026
- PepIndexSep 29, 2026
- Public regulatory warning lettersSep 30, 2026
Score history
| Date | What changed |
|---|---|
| Oct 8, 2026 | 60 to 59, grade B to CLab Testing 96 to 93. |
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