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. Every figure here is mass — milligrams and micrograms — because Thymalin is an extract with no single molecular weight, and Peptigrity states no Thymalin dose. The compound itself is covered in the Thymalin guide.
A 10 mg vial of Thymalin reconstituted with 2 mL of bacteriostatic water gives a concentration of 5.0 mg/mL, or 50 mcg per unit on a U-100 syringe.
Defaults: 10 mg is the most common labelled vial among the Thymalin tests on file, 21 Sep 2026 (22 of 47); 2 mL was chosen for simple arithmetic and is not a sourced volume. Peptigrity publishes no Thymalin 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 10 mg vial first.
Thymalin has 47 independent lab tests on file at Peptigrity, averaging 97.93% 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 Thymalin lab-test records.
Thymalin is a thymic polypeptide complex developed by Vladimir Khavinson's group at the Saint Petersburg Institute of Bioregulation and Gerontology. It is approved for medical use in Russia and several CIS countries for immune-modulation indications, but its human data comes almost entirely from that one group: cohort studies, some with 10–15 year follow-up, that are largely non-blinded, with limited independent replication and no Western-standard randomized controlled trial published as of August 2026. The compound page says Russian clinical practice varies by indication and states no figure from it, and it declines to give a dose.
The table summarises what the Thymalin compound page states (last updated August 2026).
| Question | What the compound page states | Evidence level |
|---|---|---|
| What is it? | A polypeptide extract from bovine or calf thymus tissue, not a single defined peptide sequence | Composition |
| A molecular weight? | None — a multi-component extract has no single one | Follows from the composition |
| Human studies? | Khavinson-group cohort studies, largely non-blinded; no Western-standard RCT (as of August 2026) | Russian clinical; independent replication limited |
| An approved dose? | Approved in Russia and several CIS countries; no dose from that practice is stated | None stated |
| A research dose? | None — "Does Peptigrity recommend a Thymalin dose? No." | None — declined |
A molecular weight belongs to one defined molecule. Thymalin is not one: the compound page describes it as a polypeptide extract of thymus tissue, a mixture of constituent peptides rather than a single sequence. A mixture has no single molecular weight, so converting Thymalin milligrams into moles (nanomoles, micromoles) is undefined — any figure that did so would be borrowing the mass of a molecule that is not in the vial. Everything below is therefore mass arithmetic: milligrams of labelled material, millilitres of water, micrograms per unit.
The same composition limits what a certificate can say. The compound page notes that HPLC profiles for Thymalin show a complex multi-component pattern, that vendor batches may vary substantially in composition, that some research-grade "Thymalin" is actually a synthesized peptide rather than the thymus extract, and that purity verification standards for extracts differ from those for synthesized peptides. The purity average in the lab record above is computed from the figures the labs reported; for an extract it does not read the same way as a purity figure for a single-sequence peptide.
The table converts reference quantities to syringe units at the default of 5.0 mg/mL (10 mg of Thymalin 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 5.0 mg/mL | Volume | Draws from a 10 mg vial | Draws from a 20 mg vial |
|---|---|---|---|---|
| 100 mcg | 2.0 units | 0.02 mL | 100 | 200 |
| 250 mcg | 5.0 units | 0.05 mL | 40 | 80 |
| 500 mcg | 10.0 units | 0.10 mL | 20 | 40 |
| 1 mg | 20.0 units | 0.20 mL | 10 | 20 |
| 2 mg | 40.0 units | 0.40 mL | 5 | 10 |
The same Thymalin 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 10 mg/mL (10 mg + 1 mL) | At 5.0 mg/mL (10 mg + 2 mL) | At 2.0 mg/mL (10 mg + 5 mL) |
|---|---|---|---|
| 100 mcg | 1.0 units | 2.0 units | 5.0 units |
| 250 mcg | 2.5 units | 5.0 units | 12.5 units |
| 500 mcg | 5.0 units | 10.0 units | 25.0 units |
| 1 mg | 10.0 units | 20.0 units | 50.0 units |
| 2 mg | 20.0 units | 40.0 units | 100.0 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 Thymalin 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 Thymalin, and the compound page states none, so the volume is a choice. The one decision with real consequences is resolution: a small quantity drawn from a strong solution sits at two or three units, where a one-unit misread is a large error, and the fix is more water. 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 Thymalin-specific finding.
Thymalin is approved for medical use in Russia and several CIS countries for immune-modulation indications. It is not approved by the FDA, EMA or major Western regulators, and outside its approved markets it is sold as a research-use-only compound by third-party laboratories. No active FDA approval pathway exists for Thymalin as of August 2026, and the FDA's position on bioregulator peptides has been in flux during 2025–2026.
Independent test records: Thymalin lab tests. Tracked prices: Thymalin price per milligram. The other Khavinson compounds: bioregulator peptides. A single-sequence thymic peptide, for contrast: the Thymosin Alpha-1 calculator.
By mass, at the page default of 5 mg/mL (a 10 mg vial with 2 mL of water), each unit on a U-100 syringe carries 50 mcg, so 500 mcg is 10 units (0.10 mL). With 5 mL in the same vial (2 mg/mL) it is 25 units. A units figure quoted without a concentration cannot be used.
There isn't one Peptigrity states. Thymalin is approved in Russia and several CIS countries, but the compound page says Russian clinical practice varies by indication and gives no figure, 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.
Because Thymalin has no single molecular weight. It is a polypeptide extract from bovine or calf thymus tissue, not a single defined peptide sequence, so a mass-to-mole conversion is undefined. Every figure on this page is mass: milligrams and micrograms.
No. Thymosin Alpha-1 is a single-sequence synthetic peptide; Thymalin is a multi-component extract of thymus tissue with a proposed epigenetic mechanism. They are not interchangeable.
No. Thymalin is approved for medical use in Russia and several CIS countries for immune-modulation indications, but it is not approved by the FDA, EMA or other major Western regulators, and no active FDA approval pathway exists for it as of August 2026.