Testagen
Price and cost-per-mg comparison
Testagen is a synthetic tetrapeptide and Khavinson-class peptide bioregulator derived from testicular tissue, investigated for regulatory effects on testicular cell function and age-related reproductive hormone decline. Like other Khavinson-class bioregulators, testagen is proposed to act as a short regulatory peptide that modulates gene expression in target organ cells — in this case, testicular Leydig cells responsible for testosterone synthesis and Sertoli cells that support spermatogenesis. The Khavinson bioregulator model posits that short peptides derived from specific tissues preferentially interact with chromatin regulatory elements in homologous tissues, restoring expression of age-downregulated genes and partially reversing organ-level functional decline associated with aging. Research interest in testagen centers on age-associated decline in testicular function, including reduced Leydig cell activity and the associated decline in testosterone biosynthesis that characterizes male aging. Preclinical studies have examined testagen-class peptides for effects on reproductive hormone levels, testicular histomorphology, and markers of gonadal function in aged animal models. Testagen is part of the broader Khavinson bioregulator research program that has also characterized thymalin (thymus), cortagen (cardiovascular/neural), cartalax (cartilage), and pinealon (pineal gland) as organ-specific regulatory peptides. Testagen benefits investigated in preclinical research include support for testosterone biosynthesis pathways, maintenance of Leydig cell populations, and preservation of testicular tissue architecture with aging. These effects are proposed to occur through epigenetic regulatory mechanisms rather than direct hormonal supplementation, distinguishing bioregulator peptides from exogenous testosterone replacement. Testagen is classified as a research compound with no regulatory approval in any jurisdiction. No human clinical trials have established safety or efficacy for testicular support, testosterone augmentation, or reproductive function endpoints. Research protocols have examined testagen primarily via subcutaneous injection, with oral delivery also studied in bioregulator research contexts.
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Filter by vial size and quantity — the figures and table follow.
| Vendor | Size | Price | Cost per mg▲ | COA | Source | Availability | Actions |
|---|---|---|---|---|---|---|---|
10 mgsingle vials2 listingsmedian $3.25 / mg | |||||||
US Testagen | 10 mg vial | $29.00 | $2.90Lowest | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US TESTAGEN PEPTIDE 10MG VIAL | 10 mg vial | $35.99 | $3.60 | — | Vendor feed · 4 wk ago | — | View ↗ |
20 mgsingle vials14 listingsmedian $2.87 / mg | |||||||
US Testagen | 20 mg vial | $44.00 | $2.20Lowest | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US Finnrick A Testagen 20mg | 20 mg vial | $49.95 | $2.50 | Vendor feed · 2 mo ago | — | View ↗ | |
US Testagen 20mg | 20 mg vial | $49.99 | $2.50 | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US TESTAGEN 20MG | 20 mg vial | $54.00 | $2.70 | — | Vendor feed · 2 wk ago | Out of stock | View ↗ |
US Testagen 20mg | 20 mg vial | $54.99 | $2.75 | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US Finnrick A Testagen Peptide (20MG) | 20 mg vial | $55.00 | $2.75 | — | Vendor feed · 2 wk ago | Out of stock | View ↗ |
US Finnrick A Testagen (20mg) | 20 mg vial | $55.00 | $2.75 | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US Finnrick C Testagen, 20mg | 20 mg vial | $59.95 | $3.00 | Vendor feed · 2 wk ago | In stock | View ↗ | |
US Testagen (Bioregulator) – 20mg | 20 mg vial | $59.99 | $3.00 | Vendor feed · 2 wk ago | In stock | View ↗ | |
US Testagen – 20MG | 20 mg vial | $60.00 | $3.00 | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US Testagen 20mg | 20 mg vial | $60.00 | $3.00 | Vendor feed · 2 wk ago | In stock | View ↗ | |
US Testagen – 20MG | 20 mg vial | $63.00 | $3.15 | Vendor feed · 2 wk ago | In stock | View ↗ | |
US Testagen | 20 mg vial | $80.00 | $4.00 | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US Testagen 20mg | 20 mg vial | $175.00 | $8.75 | Vendor feed · 7 wk ago | — | View ↗ | |
10 × 10 mg10-vial packs1 listing | |||||||
US Testagen 10 mg (10 vials) | 10 × 10 mg100 mg total | $250.00$25.00 / vial | $2.50 | Vendor feed · 7 wk ago | — | View ↗ | |
10 × 20 mg10-vial packs1 listing | |||||||
US Testagen 20 MG (10 vials) | 10 × 20 mg200 mg total | $250.00$25.00 / vial | $1.25 | Vendor feed · 2 wk ago | In stock | View ↗ | |
Not comparableno resolvable mg — shown, not ranked3 listings | |||||||
CA Testagen — 20mg | Khavinson Peptide Bioregulator | mg not resolved | $72.00 | — | Vendor feed · 2 wk ago | In stock | View ↗ | |
US Testagen | mass not stated | $69.99 | — | — | Vendor feed · 2 wk ago | In stock | View ↗ |
US Testagen | mass not stated | $80.00 | — | Vendor feed · 2 wk ago | Out of stock | View ↗ | |
— in COA: no certificate on file for this vendor— in availability: stock not read at the last checkPrices as scraped; foreign prices converted to USD
When Testagen prices moved
5 days in the last 120 on which a feed run read comparable Testagen prices from 3 or more vendors. Each point is the median $/mg across every comparable listing read that day, sized by how many vendors were read. A log of run days, not a continuous series.
Show as a table
| Date | Median $/mg | Vendors read |
|---|---|---|
| 28 Sept 2026 | $2.83 | 13 |
| 19 Sept 2026 | $2.75 | 11 |
| 26 Aug 2026 | $3.00 | 13 |
| 25 Aug 2026 | $3.00 | 13 |
| 21 Aug 2026 | $2.75 | 9 |
How these prices are computed
The short version. The methodology page has the rest.
Source
Prices are read from each vendor's own store feed or product markup (Vendor feed). Every row says which source it came from and when it was read. Prices parsed from page text are not in this index.
$/mg
Listed price ÷ stated milligrams, converted to USD. Packs are priced on total milligrams. Listings sold per kit, per ml, as capsules or sprays, as blends, or without a stated mass are shown but not ranked.
Population
Active online research vendors only. Clinic, pharmacy and telehealth prices are excluded. Medians and the p25–p75 band are computed over comparable listings, one row per vendor product and size.
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Educational research tools — not medical advice.