Thymulin_Dosage, benefits & legal status
Also known as serum thymic factor, FTS, facteur thymique serique, zinc thymulin
A thymus peptide studied for immune balance and calming inflammation.
Common vial size is what vendors typically sell, not a recommendation. Enter your own vial in the calculator.
What is Thymulin?
Plain language first. The technical label stays, but it never stands alone.Overview
It is studied for balancing immune function and calming inflammation and pain. Human data is limited.
Thymulin is a zinc-dependent thymus peptide involved in immune-cell maturation.
What it's used for
A thymus peptide studied for balancing immune function and calming inflammation and pain.
How does Thymulin work?
What it does in the body, and where.Thymulin only works when bound to zinc. Without it the molecule is inactive, which makes it unusual and makes zinc status directly relevant.
- 01It requires zinc to become activeThe peptide and the mineral together form the working molecule.
- 02It helps immune cells matureParticularly T cells, in the thymus.
- 03It has shown pain and inflammation effects in animalsSeparate from its immune role, and the reason for some of the current interest.
- 04Human data is limitedMostly observational work on declining levels with age.
A schematic of the compound's mechanism, not a diagnostic image.
What else is it used for?
Each use below carries its own evidence level. Approved means regulators have cleared it for that purpose. Investigational means it is in trials. Early research means it is being studied and is not established.
- Immune balance and calming inflammationResearch only
- Pain reductionResearch only
The published record
Papers and trials about Thymulin
Searched: thymulin, facteur thymique serique, serum thymic factor.
Left out: FTS (matches many abbreviations).
183 papers tagged human · 117 not reviews or lab · 7 clinical trial publications
Furthest stage reached: Published trials only, 7 clinical trial publications, no phased trial registered
Compare this against the whole library →
Category 3RegulatorsCounted from Europe PMC indexing, not read by a person; a human tag can land on reviews, commentary or lab papers; clinical trial publications is the narrower count. 445 papers and 0 trials indexed in detail.
At a glance
Four things to know about Thymulin
How much, and do you cycle it?
The range, and whether you take breaks.1 mg per dose, daily/weekly. No established schedule No range
No published study has established how long to take this or whether a break is needed. Schedules quoted online come from vendors and forums, and different sources disagree.
Nothing publishedNo figure
No half-life has ever been published for any of the Russian bioregulator peptides, in people or in animals. The research behind them, mostly from one group in St Petersburg, measures effects on tissue, gene activity and lifespan. None of it measures how long the peptide stays in the body.
You can compare this against the whole library to see where it sits.
How do I dose and price it?
Enter your vial and your dose. Pick a mix. We show the draw and the cost.The vial holds a fixed amount of drug. Adding more water does not make more drug, it just spreads it thinner, so you draw a bigger number on the syringe for the same dose.
Choose your mix
Measuring the water1 mL = one full 100-unit syringe.
Thymulin starts at $19.99 across 21 vendors, typically $2.88 – $9.00 per mg.
26 listings, last read Oct 24, 2026. Shipping and card fees are not included.
How do you store it?
Before mixing, and after.Dry powder in the freezer or fridge. Once mixed, fridge, and use within about a month.
Unmixed lyophilized Thymulin keeps for a long time cold. Once you add water the clock starts: most reconstituted vials hold up for roughly 28 to 30 days at fridge temperature. Keep it out of light, and do not freeze it after mixing.
What are the side effects and cautions?
Known cautions and warnings for this compound.Solubility, computed: 33% charged residues, 11% hydrophobic. Water usually sufficient.
A first-pass rule from peptide manufacturers' guidance. It does not account for disulfide bridges, salt form or how the powder was dried, and it predicts what should be easy rather than what will happen in your vial.
Who should avoid it
- No controlled human safety trials exist
- Pregnancy
Stop and get help
- Signs of an allergic reaction
- Anything unusual, given the absence of human data
Common effects
- Unknown in humans. Studied mainly in laboratory and animal settings
Where this page says nothing is established, that means nobody has studied it, not that a compound is safe.
Is Thymulin approved?
And where the numbers on this page come from.No. Thymulin is not approved for any use, anywhere. It is sold labeled for laboratory research only, and there is no legal route to buy it for human use.
- Approval statusResearch only
- RouteUnder the skin (subcutaneous)
- Checked14 August 2026
- DoseFrom community reports. No regulator or trial established this dose.
- Vial sizeFrom what vendors typically list; not a recommendation.
- SourcesNone traced yet.
What has happened recently
We have not yet written a full regulatory note for this compound. The status above is current as of the date shown.
What regulators say
From official documentsCategory 3
Listed as Thymulin acetate
Checked 11 September 2026FDA: Bulk Drug Substances Nominated for Use in Compounding Under Section 503A (interim categories 1, 2, 3), updated May 14, 2026
You can compare this against the whole library, or read how to check a seller.
What else is like Thymulin?
Others in Immune support, side by side.If you're weighing Thymulin, it's worth reading Thymogen, Crystagen, and Bulevirtide (Hepcludex) in the same class.
A thymus peptide studied for immune balance and calming inflammation.
- Dose
- 1 mg per dose
- How often
- Daily/weekly
A short immune bioregulator taken in courses, with thin evidence.
- Dose
- Varies (course-based)
- How often
- Courses
A lab-made 3 amino acid peptide aimed at the immune system.
- Dose
- Research only
- How often
- Daily, in 10-20 day courses
A 47-residue lipopeptide that locks the receptor hepatitis B and D use to get into the liver. EU-approved since 2020, US since May 2026.
- Dose
- 8.5 mg daily (US label); 2 mg daily (EU label)
- How often
- Once daily
Guides for this compound
- How to Reconstitute a Peptide
Mix peptide powder with bacteriostatic water, step by step.
- How to Read an Insulin Syringe
Read the units, convert to millilitres, and draw the exact dose.
- mcg vs mg: The Peptide Dosing Mistake to Avoid
Your vial says mg and your protocol says mcg. Here is the conversion and how to check it.
- How to Read a Peptide COA
What the purity number does and does not tell you, and how to spot an edited report.
- How to Vet a Peptide Vendor
Independent COAs, HPLC purity, and the red flags that mean walk away.
Sources
No primary source has been traced for this compound yet. Treat everything on this page as unverified until one is. How we grade evidence
Beyond these, 445 records are indexed. Browse the records