A buyer’s guide to research peptide vendors
Compare peptide vendors before you order.
What each vendor charges per milligram, how fast it ships, and whether its vials passed an independent lab. One score, every input shown.
- Vendors
- 24
- Lab results
- 626
- Compounds
- 12
Top six vendors, compared on
Overall score
Purity 40%, trust 25%, delivery 20%, price 15%.
Out of 100
- 1
Solution Peptides 95.6 - 2
Atomik Labz 94.2 - 3
Ion Peptides 89.2 - 4
Crush Research 85.4 - 5
Glacier Aminos 85.1 - 6
Orbitrex Peptides 84.6
Keep scrolling to re-sort these six on delivery, price, purity, and trust. The top two are scored on sample rows while our own testing round completes.
How the score is built
Four questions, in the order a buyer asks them.
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01 / Delivery
When does it arrive?
20% of the score
1 day
fastest estimate on the board; the median vendor takes 3
Business days from order to doorstep for a US address, estimated from each vendor’s published cutoff and carrier. One day scores 100 and each extra day costs nine points. Same-day cutoffs, carriers, and free-shipping thresholds are listed on every vendor page.
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02 / Price
What does it cost?
15% of the score
0.10x to 4.00x
the market median price per milligram, across every listing we track
Every listing is converted to dollars per milligram and set against the median for that compound across the board, so a 5 mg vial and a 10 mg vial compare fairly. At the median a vendor scores 70; 30% under scores 100. A cheap vial that fails is not a bargain, which is why price carries the smallest weight.
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03 / Purity
Is what is in the vial what the label says?
40% of the score
73%
of 626 independent samples on the board met the standard
The share of a vendor’s recent independent samples that passed, with newer results counting for more and thin histories pulled toward the board average. This is the only pillar measured in a lab, so it carries the most weight. Vendor certificates are linked for reference and never scored.
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04 / Trust
Can I check it myself?
25% of the score
15 of 24
vendors publish certificates that re-check on the lab’s own site
Seven things you can verify before paying: certificates readable before checkout, a lot number that matches the vial, a named lab, a report that re-checks at that lab, mass spec identity, years of trading, and no public enforcement actions. Each is worth a fixed number of points, and each is shown on the vendor page.
The board
Top ten, with the shopping facts first.
Delivery and price are what you feel first; purity and trust are what you find out later. The overall score weighs all four. The full list, compound views, and filters are on the rankings page.
Snapshot Oct 28, 2026
- 1 Solution Peptides 24 of 24 samples passed 100 1 day 80 0.90x median 97.7 24 tests 98 of 100 1 day | 0.90x 95.6
- 2 Atomik Labz 24 of 24 samples passed 91 2 days 81 0.89x median 97.0 24 tests 100 of 100 2 days | 0.89x 94.2
- 3 Ion Peptides 5 of 5 samples passed 91 2 days 71 0.99x median 90.9 5 tests 96 of 100 2 days | 0.99x 89.2
- 4 Crush Research 14 of 18 samples passed 82 3 days 99 0.71x median 75.3 18 tests 96 of 100 3 days | 0.71x 85.4
- 5 Glacier Aminos 7 of 8 samples passed 82 3 days 73 0.97x median 86.8 8 tests 92 of 100 3 days | 0.97x 85.1
- 6 Orbitrex Peptides 40 of 48 samples passed 91 2 days 72 0.98x median 81.5 48 tests 92 of 100 2 days | 0.98x 84.6
- 7 Modern Aminos 5 of 6 samples passed 91 2 days 61 1.09x median 82.6 6 tests 96 of 100 2 days | 1.09x 84.4
- 8
Peptidology 17 of 21 samples passed 82 3 days 80 0.90x median 84.8 21 tests 84 of 100 3 days | 0.90x 83.3 - 9
Peptide Partners 77 of 105 samples passed 82 3 days 80 0.90x median 75.9 105 tests 96 of 100 3 days | 0.90x 82.8 - 10
Peptide Maxxing No independent results yet 91 2 days 72 0.98x median 74.6 0 tests 90 of 100 2 days | 0.98x 81.3
Overall = 40% purity + 25% trust + 20% delivery + 15% price. Why those weights
Three lenses
Sorted the way people actually shop.
Each list is one column of the board sorted on its own. None of them is a recommendation; the overall score is what weighs them together.
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Quickest to the door
By estimated business days from order to doorstep.
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Lowest price per milligram
Among tested vendors whose recent samples mostly pass.
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Most independent results
Depth of history, not quality of it.
By compound
Pick the compound first.
The vendor that leads one compound can trail on another, and the median price per milligram varies by a factor of 77 across the twelve. Each compound has its own board, with pass counts and prices for that compound alone.
Metabolic
- Retatrutide 84% of 185 passed
Solution Peptides leads at 95.6 $7.00/mg median - Tirzepatide 83% of 102 passed
Atomik Labz leads at 94.2 $5.10/mg median - Semaglutide 87% of 52 passed Solution Peptides leads at 95.6 $6.24/mg median
- Cagrilintide 100% of 4 passed Solution Peptides leads at 95.6 $9.29/mg median
Recovery
Skin and longevity
Growth hormone axis
The standard
What has to be true for a vial to pass.
All of it, or the sample fails. There is no partial credit and no blended score for a single vial; a vendor’s purity score is just how often its recent samples pass. Where Finnrick publishes only the outcome, we use the outcome it published and say so on the row.
-
01
MS
The right molecule
Mass spectrometry has to find the compound named on the label. A pure vial of the wrong peptide is a fail.
-
02
99.5%
At least this pure
Main-peak area by HPLC. A 99.0% vial reads as clean in most contexts. Here it fails, because the vendors at the top clear 99.5% routinely.
-
03
±25%
The amount on the label
Measured quantity against the label claim. A 10 mg vial holding 7 mg is a short fill, however clean the powder.
-
04
Lot
Paper that matches the glass
The lot on the certificate has to be the lot on the vial. This one is scored under trust, but a vial with no lot cannot be matched to anything.
Vendor certificates are linked on every page and never scored.
Fresh from the lab
The eight most recent results.
New results move the board the day they are published, and newer ones count for more. Every row names its source and links to the vendor it belongs to.
Open the board- Solution Peptides Retatrutide | 99.88% fill 100%
Pass
- Solution Peptides Semaglutide | 99.81% fill 100%
Pass
- Orbitrex Peptides GHK-Cu | via Finnrick figures not published
Pass
- Peptidology Tesamorelin | via Finnrick figures not published
Pass
- Peptide Partners Retatrutide | via Finnrick figures not published
Pass
- Solution Peptides Cagrilintide | 99.78% fill 101%
Pass
- Solution Peptides BPC-157 | 99.80% fill 99%
Pass
- Glacier Aminos Retatrutide | via Finnrick figures not published
Pass
Before you order
Questions buyers ask first.
Which vendor is cheapest?
It depends on the compound and the vial size, which is why every listing here is converted to dollars per milligram and compared with the median for that compound. The rankings page sorts any compound by price, and the vendor pages show each listing against the median. Price is only 15% of the overall score because a cheap vial that fails the standard is money gone, not money saved.
How fast will an order arrive?
Each vendor page lists the dispatch cutoff, the carriers, and our estimate of business days from order to doorstep for a US address. The estimates come from the vendor’s published terms, not from measured parcels, and the fastest on the board is 1 day against a median of 3. A vendor that ships from China is listed with the two to three week wait that implies.
Where do the test results come from?
Most rows are outcomes published by Finnrick, the independent testing database, which buys samples, sends them to partner labs, and publishes pass or fail against its own standard. Those rows are linked to their source and say so. The two vendors at the top of the board are currently scored on sample rows that stand in for our own testing round; the methodology page says exactly which is which. Vendor certificates are linked for reference and never count toward the score.
Why does a 99.2% vial count as a fail?
Because the bar is 99.5%. The vendors at the top clear it routinely, and the gap between 99.2% and 99.6% is usually synthesis or cleanup quality rather than measurement noise. A sample also has to have its identity confirmed and hold within 25% of the labelled quantity. All three, or it fails.
Can a vendor pay to move up the board?
No. Every score is computed from the inputs printed on the vendor page with the formula on the methodology page, and you can recompute any of them by hand. Buy links carry no affiliate codes.
Why are some well-known vendors missing?
A vendor is listed only when its prices can be read without placing an order, because this guide compares prices. Stores that quote only by chat or email, stores whose catalog could not be read at all, raw-material suppliers, and sellers that trade only through Telegram or Discord are left off on purpose.
Is any of this medical advice?
No. Every compound here is sold for laboratory research to buyers aged 21 and over. The site compares vendors on price, delivery, independent test results, and what they let you verify. Nothing here tells anyone to buy, possess, or use a substance.