Research compounds · Thirdpartypeps LLC
Research peptides with nothing to hide.
A focused catalog of 19 research compounds, a testing standard published up front, and lot-matched COAs as they come online.
- Compounds
- 19
- Sizes
- 21
- Priced from
- $50
For research use only. Not for human consumption.
COA per batchComing soon — lot by lot
USA-basedThirdpartypeps LLC
Secure checkoutLaunching with payments
Research use onlyQualified buyers 21+
The lineup
Featured compounds
Flagship compound
Retatrutide
C221H342N46O68
A synthetic peptide investigated in laboratory research as a single-molecule agonist of the GIP, GLP-1 and glucagon receptors.
20mg30mg
from $175
For research use only. Not for human consumption.
Multi-compound
Blends
Index
Browse by category
RetatrutideGLP-1 & Metabolic · 20mg / 30mg
from$175
MOTS-CMitochondrial · 10mg
from$110
MOTS-C (Human)Mitochondrial · 40mg
from$275
5-Amino-1MQMitochondrial · 50mg
from$90
TesamorelinGHRH / GHRP Analogs · 10mg / 20mg
from$110
IpamorelinGHRH / GHRP Analogs · 10mg
from$110
CJC-1295 with DACGHRH / GHRP Analogs · 10mg
from$165
BPC-157Tissue Research · 10mg
from$75
TB-500Tissue Research · 10mg
from$90
GHK-CuTissue Research · 100mg
from$120
KLOW BlendTissue Research · 80mg
from$175
SelankNeuropeptides · 10mg
from$100
SemaxNeuropeptides · 10mg
from$100
EpithalonNeuropeptides · 50mg
from$150
NAD+NAD+ & Cofactors · 1000mg
from$210
GlutathioneNAD+ & Cofactors · 1150mg
from$140
Melanotan IMelanocortins · 10mg
from$50
Melanotan IIMelanocortins · 10mg
from$70
PT-141Melanocortins · 10mg
from$90
COA publishing · coming soon
The proof, not the promise.
Every lot will get its own certificate of analysis, matched to the lot number on the vial. No generic “sample” reports, no borrowed paperwork.
The testing standard
Don’t trust us. Check the batch.
Here is the standard we are holding our catalog to, published before the first report — so you can hold us to it.
01Planned
Identity
Mass spectrometry
Confirms the molecule in the vial has the expected molecular mass — the question a purity number can’t answer on its own.
02Planned
Purity
HPLC
Measures what share of the detected signal belongs to the target compound versus related impurities.
03Planned
Quantity
Content check
Checks that the amount in the vial matches the milligrams printed on the label.
04Planned
Endotoxin
LAL method
Screens for bacterial endotoxins, a contaminant that purity and identity tests do not detect.
05Planned
Traceability
Lot-matched COA
Every result is tied to a lot number printed on the vial, so the report you read is the report for your batch.
Beyond purity
A purity number answers one question.
A single purity percentage sounds like the whole story. It isn’t. An HPLC purity result tells you how clean a sample looks to one instrument — not what the molecule is, how much of it is in the vial, or what else might be in there. That’s why our planned standard pairs purity with identity, quantity and contaminant checks.
What a purity % measures
- The share of detected signal belonging to the main peak
- Related impurities the method can separate and see
- Consistency of a single sample, on a single run
What it doesn’t tell you
- Identity — whether the main peak is the right molecule
- Quantity — whether a “10 mg” vial holds 10 mg
- Endotoxins — invisible to HPLC purity methods
- Your batch — unless the report is tied to your lot number
This describes the testing standard we are building toward. Batch reports will be published per lot on our COA lookup — coming soon.
Who can purchase from Third Party Peps?
Our products are sold only to qualified researchers and institutions aged 21 or older, for lawful laboratory research. By purchasing you certify that you meet these requirements.
Are these products for human consumption?
No. Every product is for research use only and is not for human or veterinary use, consumption, diagnosis, or treatment. We do not sell products intended for personal use.
Are certificates of analysis (COAs) available?
COA publishing is coming soon. Reports will be published per lot and matched to the lot number printed on the vial, and will be searchable on our testing page.
Do you provide dosing or usage instructions?
No. We do not provide dosing, administration, or usage guidance of any kind. Product descriptions are for identification in a research context only.