Northline Labs shows lot-level test results with endotoxin, but doesn't say who ran them. When we checked on October 21, 2026, its product pages showed a lot-numbered certificate summary for each listing, and it offers a purity-match guarantee. It names no lab, address or company, all sales are final, and 24 of the 39 listings we priced were above the median in our price index.
Notice: Northline Labs' products are sold for in-vitro laboratory research only. They are not FDA-approved and not for human or animal use. This review covers supplier transparency and prices. We didn't buy or test any products. Some vendors pay us a commission when you buy through our links. That never changes a score or a price ranking.
Northline Labs at a glance
- Website: northlinelabs.org, live when checked.
- Based in: not published; support hours are listed in Central Time.
- Company: no legal entity named.
- Testing labs/COAs: lot-numbered summaries on product pages, with links to purity and endotoxin reports; lab not named; its COA lookup returned nothing when we loaded it.
- Independent tests (Finnrick): a Finnrick profile exists but lists 0 tests.
- Refunds: all sales final; a 'purity-match guarantee'.
- Gate: none found.
- Catalog: 51 products, including HCG 5000 IU and IGF-1 LR3; GLP-class items under codes (NL-RT-3, NL-TR-2, NL-SM-1).
- Checked: October 21, 2026.
Prices we checked
| Peptide | Size | Price | Per mg | vs index median |
|---|---|---|---|---|
| Retatrutide (listed as NL-RT-3) | 10mg | $71.99 | $7.20 | 21% above |
| Retatrutide (listed as NL-RT-3) | 15mg | $89.99 | $6.00 | at the median |
| Retatrutide (listed as NL-RT-3) | 20mg | $116.99 | $5.85 | at the median |
| Retatrutide (listed as NL-RT-3) | 30mg | $170.99 | $5.70 | 4% below |
| Retatrutide (listed as NL-RT-3) | 50mg | $269.99 | $5.40 | 10% below |
| Retatrutide (listed as NL-RT-3) | 100mg | $386.99 | $3.87 | 35% below |
| Cagrilintide | 10mg | $98.99 | $9.90 | 20% below |
| BPC-157 | 10mg | $79.19 | $7.92 | 44% above |
| BPC-157 | 20mg | $94.49 | $4.72 | 14% below |
| TB-500 | 10mg | $89.99 | $9.00 | 29% above |
| GHK-Cu | 100mg | $89.99 | $0.900 | 38% above |
| GLOW blend | 70mg | $121.49 | $1.74 | 8% above |
| KLOW blend | 80mg | $152.99 | $1.91 | 15% above |
| Ipamorelin | 10mg | $67.49 | $6.75 | 7% above |
| Tesamorelin | 10mg | $71.99 | $7.20 | 4% below |
| Tesamorelin | 20mg | $112.49 | $5.62 | 25% below |
| Sermorelin | 10mg | $89.99 | $9.00 | 12% above |
| MOTS-c | 10mg | $76.49 | $7.65 | 91% above |
| MOTS-c | 40mg | $116.99 | $2.92 | 27% below |
| NAD+ | 500mg | $80.99 | $0.162 | 35% above |
| NAD+ | 1000mg | $116.99 | $0.117 | at the median |
| SS-31 | 10mg | $53.99 | $5.40 | 10% above |
| SS-31 | 50mg | $143.99 | $2.88 | 41% below |
| Epitalon | 10mg | $79.19 | $7.92 | 126% above |
| 5-Amino-1MQ | 10mg | $80.99 | $8.10 | 209% above |
| 5-Amino-1MQ | 50mg | $179.99 | $3.60 | 37% above |
| AOD-9604 | 5mg | $71.99 | $14.40 | 37% above |
| AOD-9604 | 10mg | $98.99 | $9.90 | 6% below |
| DSIP | 10mg | $71.99 | $7.20 | 6% above |
| Kisspeptin-10 | 10mg | $89.99 | $9.00 | 50% above |
| KPV | 10mg | $67.49 | $6.75 | 23% above |
| Melanotan II | 10mg | $62.99 | $6.30 | 57% above |
| Pinealon | 10mg | $71.99 | $7.20 | 106% above |
| PT-141 | 10mg | $80.99 | $8.10 | 80% above |
| Selank | 10mg | $80.99 | $8.10 | 62% above |
| Semax | 10mg | $80.99 | $8.10 | 80% above |
| Semax | 30mg | $107.99 | $3.60 | 20% below |
| Thymosin Alpha-1 | 10mg | $89.99 | $9.00 | 13% above |
| VIP | 10mg | $76.49 | $7.65 | at the median |
Prices as listed on October 21, 2026, with the roughly 10% sale applied. 24 of 39 listings were above the median per mg across the vendors in our price index. Large vials are its best value: retatrutide 100mg (35% below), MOTS-c 40mg (27% below), SS-31 50mg (41% below) and tesamorelin 20mg (25% below). Small vials were well above, such as 5-Amino-1MQ 10mg (209% above), epitalon 10mg (126% above) and pinealon 10mg (106% above). We couldn't confirm sizes for NL-TR-2 (tirzepatide) or NL-SM-1 (semaglutide), so they're not priced. See retatrutide prices.
Orders ship the same or next business day by FedEx 2-3 day, free over $250. Shipping protection is added by default; without it, lost or damaged shipments aren't covered. Northline also offers net terms to 'labs, clinics, and resellers'.
Testing and COAs
Each product page shows a lot-numbered certificate summary. The retatrutide listing (NL-RT-3), for example, shows lot NLR-3-1105559 with HPLC purity 99.58%, MS identity confirmed and endotoxin 'tested', with links to the purity and endotoxin reports. That lets you tie a vial to a batch, and endotoxin testing is more than many vendors show.
The gaps: the site says testing is done by 'an independent laboratory' at an 'accredited laboratory' but never names it, and its COA lookup page returned no certificates when we loaded it. Its 'purity-match guarantee' promises a refund or replacement if independent testing doesn't match the COA. Finnrick lists no tests yet.
Red flags
Northline lists HCG 5000 IU, a prescription hormone, alongside its research peptides. That's a red flag under our scoring.
What we like
- Lot-numbered certificate summaries on product pages, including endotoxin.
- A purity-match guarantee.
- Below-median prices on large vials such as retatrutide 100mg.
- Same or next business day FedEx shipping.
What to watch
- The testing lab isn't named, and the COA lookup page was empty.
- All sales final; shipping protection needed for loss or damage cover.
- 24 of 39 prices above our index median.
- Sells HCG.
- On-site review counts (867 on one product) that we can't verify.
- No address, company name or Finnrick tests.
How it compares
If you like Northline's lot summaries, Mile High Compounds and Nura Peptide show the same kind of lot data with the lab named. For larger GLP-class vials at lower prices, compare the retatrutide price index. See all vendors we track.
Bottom line
Northline Labs gives you more lot data than most, including endotoxin, and stands behind it with a purity-match guarantee. The unnamed lab, the empty lookup page, final-sale terms and above-median pricing on most items keep it in the middle of our directory.
Last checked October 21, 2026.
