Testagen
One of the Khavinson "bioregulator" peptides from Russian aging research, marketed for the testes. Evidence comes mainly from Russian cell and animal studies.
Sold as a supplement in Russia; not approved in the US. Research use only.
Look it up on Wikipedia22 listings across 19 independently tested vendors, ranked by price per milligram after coupon codes anyone can use. Vendors you can only order from by message are hidden.
Some links here are affiliate links: if you buy through one, this site may earn a commission at no extra cost to you. Prices, rankings and plans are worked out the same way whether or not a vendor pays one.
Not an FDA-approved drug and not nominated for FDA's 503A bulks list, so US pharmacies can't legally compound it.
Daily price tracking started October 7, 2026; a price-history chart appears here once a few days have been collected.
| Vendor | Trust | Listing | Vials | Price | Per mg | |
|---|---|---|---|---|---|---|
Andy Peps Studio #64 by metascore · China |
TG20 Testagen 20mg * 10 vials | 10 × 20 mg = 200 mg | $95.00 $9.50 per vial |
$0.475 | Buy | |
Baohua Dongnuo Biotechnology BHD #77 by metascore · China |
TG20 Testagen 20mg * 10 vials | 10 × 20 mg = 200 mg | $95.00 $9.50 per vial |
$0.475 | Buy | |
LN Peptides #254 by metascore · China |
Metascore 71Finnrick 72%Bought vials 99% of label · 39 testsTitrateLabNo report for thisOnline checkout |
TG20 Testagen 20mg * 10 vials | 10 × 20 mg = 200 mg | $95.00 $9.50 per vial |
$0.475 | Buy |
BeiBangAn #28 by metascore · China |
TG20 Testagen 20mg * 10 vials | 10 × 20 mg = 200 mg | $95.00 $9.50 per vial |
$0.475 | Buy | |
Uther #62 by metascore · China |
Metascore 79Finnrick 64%Bought vials 105% of label · 73 testsTitrateLabNo report for thisOnline checkout |
Testagen 20mg (10 Vials / Kit) | 10 × 20 mg = 200 mg | $150.00 $15.00 per vial |
$0.750 | Buy |
Qingdao Sigma Chemical QSC #69 by metascore |
Testagen 20mg | 20-Vial Kit | Testicular Tissue Bioregulator | 20 × 20 mg = 400 mg | $470.00 $23.50 per vial |
$1.18 | Buy | |
Bulk Peptide Wholesale #29 by metascore |
Metascore 82 medium confidenceFinnrick 68%Bought vials 103% of label · 7 testsTitrateLab · PeptideBaseNo report for thisOnline checkout |
Testagen 20 MG (10 vials) | 10 × 20 mg = 200 mg | $250.00 $25.00 per vial |
$1.25 | Buy |
Qingdao Sigma Chemical QSC #69 by metascore |
Testagen 20mg | 10-Vial Kit | Testicular Tissue Bioregulator | 10 × 20 mg = 200 mg | $260.00 $26.00 per vial |
$1.30 | Buy | |
Peptide Crafters #57 by metascore · US |
Metascore 79Finnrick 60%PepIndex 22/100Bought vials 111% of label · 59 testsTitrateLab · Peptide CriticNo report for thisConfirmed with lab: 26 of 26Online checkout |
TESTAGEN (25mg) | 1 × 25 mg | $55.00 | $2.20 | Buy |
Amino Usa #136 by metascore · US |
Metascore 74 medium confidenceFinnrick 32%Bought vials 89% of label · 3 testsTitrateLabLab 99.5% pure · 109% of labelAccount needed |
Testagen 20mg | 1 × 20 mg | $45.00 | $2.25 | Buy |
Gulf Coast Aminos #17 by metascore |
Metascore 85 medium confidenceFinnrick 81%Bought vials 109% of label · 3 testsTitrateLabNo report for thisAccount needed |
Testagen 20mg (Limited Release) | 1 × 20 mg | $49.95 | $2.50 | Buy |
Glacier Aminos Affiliate #73 by metascore |
TESTAGEN 20MG (10-Pack) | 10 × 20 mg = 200 mg | $509.92 $50.99 per vial |
$2.55 | Buy | |
Eros Peptides #129 by metascore · US, GA 30339 |
Metascore 74 medium confidenceFinnrick 77%Bought vials 110% of label · 3 testsTitrateLab · Peptide CriticLab report (image)Online checkout |
Testagen 20MG | 1 × 20 mg | $51.00 | $2.55 | Buy |
Lab Rat Peptide #206 by metascore · US |
Testagen 20MG | 1 × 20 mg | $55.00 | $2.75 | Buy | |
Liberty Peptides #63 by metascore · US, DE 19801 |
Metascore 79Finnrick 53%Bought vials 107% of label · 18 testsTitrateLab · PeptideBaseNo report for thisOnline checkout |
Testagen (20mg) | 1 × 20 mg | $55.00 | $2.75 | Buy |
Glacier Aminos Affiliate #73 by metascore |
TESTAGEN 20MG (5-Pack) | 5 × 20 mg = 100 mg | $299.16 $59.83 per vial |
$2.99 | Buy | |
Core Peptides #282 by metascore |
Metascore 70 medium confidenceFinnrick 76%PepIndex 24/100Bought vials 92% of label · 4 testsTitrateLab · PeptideBase · Peptide Critic · PeptideCheckedNo report for thisOnline checkout |
Testagen – 20MG | 1 × 20 mg | $63.00 | $3.15 | Buy |
Dragon Pharma #42 by metascore |
Testagen (vial) [U.S. Domestic] | 1 × 20 mg | $64.80 | $3.24 | Buy | |
Amino Asylum #245 by metascore |
Metascore 71Finnrick 62%PepIndex 26/100Bought vials 100% of label · 15 testsTitrateLab · PeptideBaseNo report for thisOnline checkout |
Testagen 20MG | 1 × 20 mg | $64.99 | $3.25 | Buy |
Atomik Labz Affiliate #85 by metascore · US. Florida, 33411 |
Metascore 77Finnrick 69%Bought vials 112% of label · 44 testsTitrateLab · Peptide CriticNo report for thisOnline checkoutCheck vendor |
Testagen 20mg | 1 × 20 mg | $65.00 | $3.25 | Buy |
Glacier Aminos Affiliate #73 by metascore |
TESTAGEN 20MG | 1 × 20 mg | $67.99 | $3.40 | Buy | |
Pura Peptides #81 by metascore |
Metascore 77Finnrick 66%Bought vials 107% of label · 20 testsTitrateLab · Peptide CriticNo report for thisOnline checkout |
Testagen 20 mg | 1 × 20 mg | $75.00 | $3.75 | Buy |
Mixing a 20 mg vial
What each common amount of bacteriostatic water gives you on a U-100 insulin syringe. Pick a vial size above to change it.
| Water | Strength | Per 10 units (0.1 mL) | Per unit |
|---|---|---|---|
| 1 mL | 20 mg/mL | 2,000 mcg | 200 mcg |
| 2 mL | 10 mg/mL | 1,000 mcg | 100 mcg |
| 3 mL | 6.667 mg/mL | 666.7 mcg | 66.67 mcg |
| 5 mL | 4 mg/mL | 400 mcg | 40 mcg |
Published lab results
4 certificates of analysis that vendors publish for Testagen. Numbers are only filled in where the document is readable text; image-only COAs are linked without numbers. A vendor's own COA shows one tested sample, not every batch.
| Vendor | Lab | Date | Label | Measured | Purity | Batch | |
|---|---|---|---|---|---|---|---|
Amino Usa |
BioRegen | 2026-07-03 | 20 mg | 21.7 mg 109% | 99.53% | 26TESTA20-0004 | View |
Qingdao Sigma Chemical QSCCOA note |
– | 2026-05-18 | 20 mg | – | – | QSC TG20 | View (image) |
Eros PeptidesCOA note |
Janoshik | – | 20 mg | – | – | View (image) | |
Shanghai Sigma Audley SSA |
Janoshik | – | 20 mg | – | – | Janoshik #76299 'Testagen_20mg' (posted 2025-08-28) | View (image) |
Doses studied in research Animal or lab studies only
What was given to people (or animals) in published studies and official labels, each linked to its source. This is not a recommendation: study products, purity and supervision differ from research-grade vials.
Animal studies: The only in-vivo work gave Lys-Glu-Asp-Gly by injection to hypophysectomized chickens and old hens for 40 days; the abstracts do not state the dose. Other papers are cell-culture or chemistry studies.
Not an approved drug, and no study has given Testagen to people. Results in birds do not translate directly to doses in people.
What the research says
Testagen (the tetrapeptide Lys-Glu-Asp-Gly) has no human studies at all in the published literature. The handful of relevant papers are cell-culture and binding work and experiments in hypophysectomized chickens, where the peptide partly restored thyroid and thymus structure.
Key papers ✓ 4? 2
-
Effects of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on hormonal activity and structure of the thyroid gland in hypophysectomized young chickens and old hens.Animalssize not reported40 daysPeptide administration after hypophysectomy
In hypophysectomized young chickens and old hens, 40 days of Lys-Glu-Asp-Gly reduced hormonal and structural thyroid changes, with a weaker normalizing effect in old hens than in chicks.
Study details
- Studied
- Hypophysectomized 5-day-old chickens and old hens
- Compared with
- Hypophysectomized birds (untreated)
- Main outcome
- Thyroid hormone concentrations and thyroid structure
- Authors' conclusion
- Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly significantly reduced hormonal disturbances and structural changes of the thyroid; the normalizing effect was less pronounced in old hens than in chickens.
- Limitations
- Bird hypophysectomy model; sample size not stated in abstract.
-
Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds.Animalssize not reportedPeptide administration after hypophysectomy
In hypophysectomized chicks of different ages, Lys-Glu-Asp-Gly promoted recovery of thymus morphology and was more effective than the related Ala-Glu-Asp-Gly peptide.
Study details
- Studied
- Hypophysectomized young and old chicks
- Compared with
- Hypophysectomized birds; Ala-Glu-Asp-Gly vs Lys-Glu-Asp-Gly
- Main outcome
- Thymus morphology
- Authors' conclusion
- Both peptides promoted recovery of thymic structure regardless of age; Lys-Glu-Asp-Gly (anterior pituitary peptide) had a more pronounced effect than Ala-Glu-Asp-Gly.
- Limitations
- Bird hypophysectomy model; sample size not stated in abstract.
-
Effect of tetrapeptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the structure and function of the thyroid gland in neonatally hypophysectomized chickens.Animalssize not reported40 daysPeptide administration
In neonatally hypophysectomized chickens, 40 days of Lys-Glu-Asp-Gly raised thyrotropin and thyroid hormone concentrations and restored thyroid structure.
Study details
- Studied
- Neonatally hypophysectomized chickens
- Compared with
- Hypophysectomized chickens
- Main outcome
- Thyrotropic and thyroid hormone concentrations; thyroid structure
- Authors' conclusion
- The tetrapeptides were followed by increased thyrotropic and thyroid hormone concentrations and recovery of thyroid gland structure.
- Limitations
- Bird model; sample size not stated in abstract.
-
[Effects of hypophyseal Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly synthetic peptides on immunity, hemostasis, morphology and functions of the thyroid gland in neonatally hypophysectomized chicken and one-year-old birds].Animalssize not reportedPeptide injection after hypophysectomy
In hypophysectomized chickens and one-year-old birds, Lys-Glu-Asp-Gly prevented thyroid atrophy and the associated immune and coagulation changes.
Study details
- Studied
- Neonatally hypophysectomized chickens and one-year-old birds
- Compared with
- Hypophysectomized birds
- Main outcome
- Thyroid morphology, immunity and hemostasis
- Authors' conclusion
- The anterior (Lys-Glu-Asp-Gly) and posterior (Ala-Glu-Asp-Gly) pituitary peptides prevented atrophic thyroid changes and normalized immune and hemostatic parameters.
- Limitations
- Bird hypophysectomy model; sample size not stated in abstract.
-
Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA.Cells / labFluorescence microscopy and quenching assays
In HeLa cells, fluorescently labelled testagen entered the cytoplasm and nucleus, showing only that the peptide can reach DNA, not that it has any clinical effect.
Study details
- Studied
- HeLa cells and in vitro oligonucleotide/DNA fluorescence assays
- Compared with
- Other short peptides (epithalon, pinealon, bronchogen)
- Main outcome
- Peptide cell/nuclear penetration and DNA binding
- Authors' conclusion
- Short FITC-labeled peptides including testagen penetrated cells and nuclei and showed sequence-specific interaction with oligonucleotides and DNA, which the authors suggest could epigenetically control gene activity.
- Limitations
- In vitro only; conclusions about gene regulation are speculative.
-
Interaction of short peptides with FITC-labeled wheat histones and their complexes with deoxyribooligonucleotides.No new dataFluorescence quenching binding assays
In a binding study, Lys-Glu-Asp-Gly and related short peptides bound wheat histones at specific sites; a mechanistic observation with no clinical outcome.
Study details
- Studied
- Short peptides and FITC-labeled wheat histones in vitro
- Main outcome
- Peptide binding to histones and histone-oligonucleotide complexes
- Authors' conclusion
- Short peptides including Lys-Glu-Asp-Gly bind wheat histones in a site-specific manner; the authors suggest this may be an epigenetic control mechanism in chromatin.
- Limitations
- Cell-free assay with plant histones; mechanistic suggestion only.
Reported side effects
No human studies and therefore no human safety data in the published literature.
1 registered human trial (1 active)
✓ positive · ✗ negative · ~ mixed · ? inconclusive, judged on each paper's own main outcome. Grades: A strong human evidence → D little or none. Papers and verdicts are drawn from PubMed, Europe PMC and Russian journals (CyberLeninka); not medical advice.
Registered clinical trials 1 on ClinicalTrials.gov · 1 active · 0 completed
| Trial | Status | Phase | People | Sponsor |
|---|---|---|---|---|
| Product Transference Study of Testagen™ TDS®-Testosterone NCT02733133 · started 2027-01-05 |
Not yet recruiting | Phase 2 | 96 | Transdermal Delivery Solutions Corp |
All 1 Testagen trials, with countries and summaries · Search ClinicalTrials.gov · Recruiting trials for every peptide
Discussions elsewhere
Experiences and questions about Testagen on other sites. Treat anecdotes with care.
Testagen: questions people ask
What is Testagen?
Russian short-peptide bioregulator. One of the Khavinson "bioregulator" peptides from Russian aging research, marketed for the testes. Evidence comes mainly from Russian cell and animal studies.
How much does Testagen cost?
The cheapest Testagen from an independently tested vendor is $0.475 per mg (Andy Peps Studio, TG20 Testagen 20mg * 10 vials, $95.00). Across 22 listings from 19 vendors the median is $2.55 per mg.
Where can I buy Testagen?
19 vendors tested by Finnrick sell Testagen. The cheapest per mg right now: Andy Peps Studio ($0.475), Baohua Dongnuo Biotechnology BHD ($0.475), LN Peptides ($0.475). 1 of them publish a lab report (COA) for Testagen; compare lab scores and reports in the table above before buying.
How much bacteriostatic water for 20 mg of Testagen?
Adding 2 mL of bacteriostatic water to a 20 mg vial of Testagen gives 10 mg/mL: each 10 units on a U-100 insulin syringe holds 1,000 mcg. With 1 mL it's 20 mg/mL (2,000 mcg per 10 units); with 3 mL, 6.667 mg/mL (666.7 mcg per 10 units). More water makes small amounts easier to measure. Mixing charts: 20 mg.
Is Testagen FDA approved?
Sold as a supplement in Russia; not approved in the US. Research use only.
Can Testagen be compounded in the US?
Not an FDA-approved drug and not nominated for FDA's 503A bulks list, so US pharmacies can't legally compound it. Compounding status for every peptide.
Does Testagen work? What does the research say?
Evidence grade C (mostly animal studies), from 6 papers: No human studies; several experiments in hypophysectomized chickens report restored thyroid and thymus structure, plus cell work, from one research group. Testagen (the tetrapeptide Lys-Glu-Asp-Gly) has no human studies at all in the published literature. The handful of relevant papers are cell-culture and binding work and experiments in hypophysectomized chickens, where the peptide partly restored thyroid and thymus structure. See the papers.
Are there clinical trials of Testagen?
ClinicalTrials.gov lists 1 registered trials of Testagen: 1 active, 0 completed. Examples: Product Transference Study of Testagen™ TDS®-Testosterone (Not yet recruiting, Phase 2, 96 people).
What dose of Testagen was used in studies?
Testagen is tested only in animals or cells. The only in-vivo work gave Lys-Glu-Asp-Gly by injection to hypophysectomized chickens and old hens for 40 days; the abstracts do not state the dose. Other papers are cell-culture or chemistry studies. These are amounts used in published studies or official labels, not a recommendation.