Enter the vial size and the bacteriostatic water you added to get the concentration and the micrograms carried by each unit on a U-100 syringe. Testagen's compound page states no dose and no route, so this page does the arithmetic, not the recommendation. The compound itself is covered in the Testagen guide.
A 20 mg vial of Testagen reconstituted with 2 mL of bacteriostatic water gives a concentration of 10 mg/mL, or 100 mcg per unit on a U-100 syringe.
Defaults: 20 mg is the most common labelled vial among the Testagen tests on file, 21 Sep 2026 (18 of 22); 2 mL was chosen for simple arithmetic and is not a sourced volume. Peptigrity publishes no Testagen dose, so the dose field starts empty.
Draw the syringe up to
Enter your own amount to see the draw. Add 2 mL of water to your 20 mg vial first.
Testagen has 22 independent lab tests on file at Peptigrity, averaging 99.66% HPLC purity across the tests that report one. Purity is not net content: a clean certificate confirms what is in a vial, not how much. See the Testagen lab-test records.
Testagen is a synthetic tetrapeptide, Lys-Glu-Asp-Gly (KEDG), from the Khavinson group's designed “Cytogen” short-peptide family, researched for testicular-tissue-targeted bioregulation, reproductive endocrine function and testosterone-pathway support. The compound page says the published work comes almost entirely from one group, Vladimir Khavinson's at the St Petersburg Institute of Bioregulation and Gerontology, and is preclinical; no Western-standard randomized controlled trial has been published as of August 2026. Asked whether Peptigrity recommends a Testagen dose, the page answers no. A calculator that printed one would be inventing it.
The table sets out what the Testagen compound page states (Last Updated: August 2026).
| Question | What the compound page states | Evidence level |
|---|---|---|
| What is it? | A synthetic tetrapeptide, Lys-Glu-Asp-Gly (KEDG), from the Khavinson “Cytogen” short-peptide family | Chemical identity |
| Proposed target? | Testicular tissue: spermatogenesis, Leydig cell function and reproductive endocrine signaling | Khavinson-framework proposal, “not established biology” |
| Human studies? | No Western-standard randomized controlled trial published as of August 2026; reported effects are single-institution and non-blinded | Preclinical; Khavinson-group research |
| A route? | Not stated. The side-effects paragraph mentions injection-site reactions among community reports; that is safety text, not a route statement | None stated |
| An approved dose? | Not approved by the FDA, EMA, or any major Western regulator (as of August 2026) | None |
| A research dose? | None stated; Peptigrity does not recommend one | None — declined |
One practical consequence: Testagen shares its first three residues with Vesugen (Lys-Glu-Asp), and the compound page describes the two as related but chemically distinct, separated by a C-terminal glycine of roughly 57 Da. A vial of Vesugen sold as Testagen would convert exactly the same way here; only a batch-matched mass-spectrometry result tells them apart. The arithmetic also works from the label, not the contents: the Testagen fact sheet records 22 results comparing measured to labelled quantity, with a median of 101.5% of label (figures as of 2026-09-21).
The table converts reference quantities to syringe units at the default of 10 mg/mL (20 mg of Testagen in 2 mL), and counts how many draws of each a vial holds. Every row is arithmetic, not a dose: read the units for the amount you already intend to measure.
| Quantity | Draw at 10 mg/mL | Volume | Draws from a 10 mg vial | Draws from a 20 mg vial |
|---|---|---|---|---|
| 100 mcg | 1.0 units | 0.01 mL | 100 | 200 |
| 250 mcg | 2.5 units | 0.025 mL | 40 | 80 |
| 500 mcg | 5.0 units | 0.05 mL | 20 | 40 |
| 1 mg | 10.0 units | 0.10 mL | 10 | 20 |
| 2 mg | 20.0 units | 0.20 mL | 5 | 10 |
The same Testagen quantity lands on a different mark depending on how much water went into the vial. Read down the column for the concentration you actually mixed; a units figure carried across from another column is simply wrong.
| Quantity | At 20 mg/mL (20 mg + 1 mL) | At 10 mg/mL (20 mg + 2 mL) | At 4.0 mg/mL (20 mg + 5 mL) |
|---|---|---|---|
| 100 mcg | 0.5 units | 1.0 units | 2.5 units |
| 250 mcg | 1.3 units | 2.5 units | 6.3 units |
| 500 mcg | 2.5 units | 5.0 units | 12.5 units |
| 1 mg | 5.0 units | 10.0 units | 25.0 units |
| 2 mg | 10.0 units | 20.0 units | 50.0 units |
Every cell is the same arithmetic: units = (quantity in mg ÷ concentration in mg/mL) × 100 on a U-100 syringe. More water spreads the same mass over more units, which is the fix when a small quantity would otherwise sit at two or three units, where a one-unit misread is a large error.
Each Testagen vial holds as many draws as its labelled mass divided by the quantity per draw; the water volume changes nothing about it. The grid counts draws, not weeks — this page states no frequency.
| Vial size | At 100 mcg | At 250 mcg | At 500 mcg | At 1 mg | At 2 mg |
|---|---|---|---|---|---|
| 10 mg | 100 | 40 | 20 | 10 | 5 |
| 20 mg | 200 | 80 | 40 | 20 | 10 |
The labelled mass is not a guarantee of the mass in your vial: net content is a separate measurement from purity, and certificates on file often measure a few percent above or below the label.
No label sets a diluent volume for research-grade Testagen, and the compound page states none, so the volume is a choice; the 2 mL default here was picked for simple arithmetic. The one decision with real consequences is resolution: a 20 mg vial in 2 mL is 10 mg/mL, where each unit carries 100 mcg and a small quantity sits at one or two units. The fix is more water: 5 mL in the same vial is 4 mg/mL, or 40 mcg per unit. The technique is covered once, elsewhere: reconstituting peptides step by step and the bacteriostatic water guide. Storage and in-use guidance there is general peptide guidance, not a Testagen-specific finding.
Pinealon, Cartalax and Testagen share one calculator template. The table gives each one's structure and proposed target as its own compound page states them (each Last Updated: August 2026), and the most common labelled vial among its tests on file on 21 Sep 2026.
| Compound | Structure | Proposed target tissue | Most common labelled vial | Calculator |
|---|---|---|---|---|
| Pinealon | Tripeptide (Glu-Asp-Arg) | Pineal / brain | 20 mg (36 of 71 tests) | Pinealon calculator |
| Cartalax | Tripeptide (Ala-Glu-Asp) | Cartilage / connective tissue | 20 mg (37 of 52 tests) | Cartalax calculator |
| Testagen | Tetrapeptide (Lys-Glu-Asp-Gly) | Testis / reproductive | 20 mg (18 of 22 tests) | This page |
None of the three compound pages states a dose or a route. Because the vials share a size, the arithmetic is the same for each; what differs is identity, which only mass spectrometry settles. Vesugen, the tripeptide Testagen extends, has its own compound page. The wider family is in the bioregulators category and the science of Khavinson bioregulators.
Testagen is not approved by the FDA, EMA, or any major Western regulator as of August 2026. The compound page states it is not on the FDA's active Section 503A/503B Category-2 bulk-substances list and was not among the peptides addressed in the FDA's April 2026 Category-2 actions or the July 2026 Pharmacy Compounding Advisory Committee meeting, so no U.S. compounding pathway applies to it. It is sold as a research-use-only compound by third-party laboratories. Background: FDA peptide regulation 2025–2026.
Independent test records: Testagen lab tests. Tracked prices: Testagen price per milligram.
It depends on the concentration. At the page default of 10 mg/mL (a 20 mg vial with 2 mL of water), each unit on a U-100 syringe carries 100 mcg, so 250 mcg is 2.5 units, where a one-unit misread is a 40% error. With 5 mL in the same vial (4 mg/mL, 40 mcg per unit) it is 6.25 units. A units figure quoted without a concentration cannot be used.
There isn't one. Testagen is not approved by any major Western regulator, the published research is preclinical and almost entirely from one group, and Peptigrity does not recommend a dose. This calculator converts a quantity you already have in mind into syringe units; it does not supply the quantity.
No. Vesugen is the tripeptide Lys-Glu-Asp; Testagen is the tetrapeptide Lys-Glu-Asp-Gly, the same three residues plus a C-terminal glycine. The compound page says they differ by about 57 Da and that mass spectrometry can distinguish them, which is why a batch-matched mass-spec check matters for Testagen.
The Testagen compound page states no route. Its side-effects paragraph says injection-site reactions are the most common report in preclinical data and community-reported research use; that is safety text, not a route statement, and this page does not treat it as one. The calculator converts the mass in a reconstituted vial into syringe units because that is the arithmetic people ask for; it establishes nothing about route.
Because 20 mg is the most common labelled size among the Testagen tests on file at Peptigrity: 18 of 22 on 21 Sep 2026. The 2 mL of water is a round number chosen for simple arithmetic, not a sourced instruction.