Testagen
Also known as: Lys-Glu-Asp-Gly
Testagen is a synthetic tetrapeptide (Lys-Glu-Asp-Gly / KEDG) from the Khavinson bioregulator series, claimed to target testicular tissue. Not FDA-approved. Evidence base is extremely thin, with essentially no independently replicated or peer-reviewed support for the advertised reproductive or endocrine benefits in humans.
Who's worth your money for Testagen
Every current seller, ranked by independent evidence — Merit Score, latest COA purity, and live $/mg (size-normalized). Prices refresh daily. Rankings are never paid.
Top Merit pick
Highest Merit Score (99) of 6 scored sellers
$67.99 · 20mg · 99.9% purity
Best value
Lowest $/mg among scored sellers
$39.99 · 20mg · 99.6% purity
Most tested
5 independent COAs on file
$79.97 · 20mg · 99.8% purity
Average price
$3.11/mg
Sellers
19
45-day trend
+5.4%
17 of 19 sellers have a current price· 5 stale hidden· 6 unverified hidden
Top Merit pick
🇺🇸 Glacier Aminos99✓ verified at source · 23h ago
$3.40/mg +9.5% vs avg$67.99
20mg
- 🇺🇸 BioLongevity Labs96
✓ verified at source · 23h ago
$4.00/mg +28.8% vs avg$79.97
20mg
- 🇺🇸 Peptide Tech94
✓ verified at source · 23h ago
$2.00/mg -35.6% vs avg$39.99
20mg
- 🇺🇸 Verified Peptides86
via Disclosed Labs · 23h ago
$2.75/mg -11.4% vs avg$55.00
20mg
- Peptide Supply Co.83
via Disclosed Labs · 23h ago
$2.10/mg -32.4% vs avg$420
200mg
no purity - 🇺🇸 OROS Research79
✓ verified at source · 23h ago
$2.75/mg -11.5% vs avg$54.99
20mg
Prices observed from public storefronts (last 24h), normalized to $/mg. "Evidence" is Merit's 0–100 Merit Score, derived only from observable verification evidence (methodology on /about); "Purity" is the latest independent COA. Some buy links are affiliate links — Merit may earn a commission at no extra cost to you, and where a vendor offers one, the code shown gets you a discount at their checkout. Affiliate status never affects price data, ranking, or the Merit Score (full policy on /disclosure). Research use only.
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About Testagen
CAS
1026993-38-3
Molecular formula
C17H29N5O9
Sequence
KEDG
Typical dose range
100–300 mcg/day subcutaneous injection; some protocols use 0.2 mg oral capsules 1–2x daily for 10–30 day cycles
Half-life
—
COAs for Testagen
113 third-party tests across 9 vendors. Each card links to the full report.
For
Melanotan 2
by EZ Peptides· batch EZP-MEL21006072026-07
For
Thymosin Alpha 1
by EZ Peptides· batch EZP-TA11006052026-04
For
Epitalon
by EZ Peptides· batch EZP-EPIT1006012026-10
For
2P 20mg (Transparent Blue / Silver)
by EZ Peptides· batch EZP-2P20051620226-04
For
Caglrilintide
by EZ Peptides· batch EZP-CA6050515202612
For
N-Acetyl Selank Amidate
by EZ Peptides· batch EZP-SEL1005192026-08
For
N-Acetyl Semax Amidate
by EZ Peptides· batch EZP-SEMX1005182026-10
For
N-Acetyl Semax Amidade
by EZ Peptides· batch EZP-SEMX10051820226-10
For
EZP - 3P
by EZ Peptides· batch EZP-3P0605132026-02
For
Melanotan 1
by EZ Peptides· batch EZP-MEL11005072026-04
For
Melanotan 2
by EZ Peptides· batch EZP-MEL21005032026-06
For
Melanotan 2
by EZ Peptides· batch EZP-MEL2100503202-06
For
Melanotan 2
by EZ Peptides· batch EZP-MEL2100503202606
For
Melanotan 2
by EZ Peptides· batch EZP-MEL210050320226-06
For
Melanotan 2
by EZ Peptides· batch EZP-MEL2100503206-06
For
5-Amino-1-methylquinolinium
by EZ Peptides· batch EZP-AMINQM5004162026-03
For
3P
by EZ Peptides· batch EZP-3P1204012026-02
For
Testagen
by Glacier Aminos· batch TST20GA-02
For
Testagen
by Kimera Chems· batch KC-TTG-RED1
For
Tirzepeptide
by EZ Peptides· batch EZP-2P1502272026-03
For
Testagen
by Skye Peptides· batch TGN26-50-001
For
3p
by EZ Peptides· batch EZP-3P4802242026-02
For
Cagrylintide 10mg(Cyan/Green)
by EZ Peptides· batch EZP-CAG10022020226-01
For
GLP-1
by EZ Peptides· batch SP-BIO202026-32
7 citations indexed for Testagen
rct · 2027
Product Transference Study of Testagen™ TDS®-Testosterone
This study will assess the potential of Testagen® TDS-Testosterone to enable transfer of Testosterone to females coming in contact with skin to which Testagen® TDS-Testosterone has been applied and the potential of product to raise serum androgen levels in those women.
animal · 2026
Relationships of Anemia, Serum Iron, and Serum Copper in Hospitalized Alpacas (Vicugna pacos)
A large number of South American camelids (SAC) presented to a veterinary clinic are diagnosed with anemia.
Study · 2025
The Inhibitory Effect and Adsorption Properties of Testagen Peptide on Copper Surfaces in Saline Environments: An Experimental and Computational Study
Experimental and theoretical studies were applied to investigate the adsorption properties of testagen (KEDG) peptide on copper surfaces in sodium chloride solution and, implicitly, its inhibition efficiency (IE) on metal corrosion.
review · 2022
Transport of Biologically Active Ultrashort Peptides Using POT and LAT Carriers
Ultrashort peptides (USPs), consisting of 2-7 amino-acid residues, are a group of signaling molecules that regulate gene expression and protein synthesis under normal conditions in various diseases and ageing. USPs serve as a basis for the development of drugs with a targeted mechanism of action.
review · 2021
Peptide Regulation of Gene Expression: A Systematic Review
Peptides are characterized by their wide range of biological activity: they regulate functions of the endocrine, nervous, and immune systems.
rct · 2012
Evaluation of the impact of the plastic BioSand filter on health and drinking water quality in rural Tamale, Ghana
A randomized controlled trial of the plastic BioSand filter (BSF) was performed in rural communities in Tamale (Ghana) to assess reductions in diarrheal disease and improvements in household drinking water quality.