Thymulin (FTS, facteur thymique sérique) is a nonapeptide thymic hormone whose biological activity is strictly ZINC-DEPENDENT, without a bound zinc ion it is inactive. This is its single most defining feature.
Thymulin Prices
4 vendors · 2 with an issuer-verified COA · lowest 10mg from $28.80 · checked
Where to buy Thymulin: 4 vendors compared
| Vendor | Price | Actions |
|---|---|---|
| 4-test panelVerified COAKovera Labs · Analysis date Jul 22, 2026 | $28.8010mg packageChecked today | Buy Thymulin from Real Peptides |
| Verified COAChromate | $38.88 | Buy Thymulin from Pantheon Peptides |
| $58.47 | Buy Thymulin from BioLongevity Labs |
Vendors with other package sizes (1)
- Eppix Labs · 20 mg
Tracked every day
Thymulin listing prices, tracked daily
The five cheapest in-stock package prices for Thymulin on each collected day, and the vendors that most often held those places.
Five cheapest in-stock package prices per day
Listed package price before coupons, any vial size. This is not the coupon-adjusted lowest 10mg price used to rank the comparison.
- Cheapest$28.80
- 2nd cheapest$43.20
- 3rd cheapest$49.99
- 4th cheapest$64.97
Vendors most often in the cheapest five
- BioLongevity Labs24 days$64.97last seen Oct 12, 20260.0%
- Real Peptides22 days$28.800.0%
- Pantheon Peptides22 days$43.200.0%
- Eppix Labs4 days$49.99last seen Oct 15, 20260.0%
Current market data
Thymulin Price Report
A current summary of public listings after the price comparison above. Shipping and tax are not included.
The lowest current 10mg cost for Thymulin is $28.80 from Real Peptides. The median across vendors is $44.44.
- Lowest 10mg cost
- $28.80Real Peptides
- Median 10mg cost
- $44.44One normalized offer per vendor
- Lowest package total
- $28.80Real Peptides · package size may differ
- Public COA coverage
- 100%4 of 4 vendors
What the market shows
PeptidePrices found 4 in-stock listings from 4 vendors, checked through Oct 16, 2026. The lowest 10mg cost is 35% below the vendor median of $44.44; 2 vendors (50%) fall below that median. 4 of 4 vendors (100%) publish public COA evidence.
A public COA link shows that a vendor publishes testing data. It does not prove that every listed vial has a matching current report. Match the product, strength, batch, and lot before relying on a report.
How this report is calculated
The headline and median use each vendor's lowest whole-package checkout cost to obtain at least 10mg. Smaller packages are multiplied until the target is met, while larger packages retain their full checkout price. The lowest package total is shown only as secondary context because package sizes differ. Known public coupon discounts are applied. Shipping, tax, and unverified promotions are excluded.
Research context
What is Thymulin? Research, safety, and status
Thymulin is a small thymic hormone first characterized by the French immunologist Jean-François Bach (originally as 'facteur thymique sérique', FTS). It is produced by thymic epithelial cells and is unusual among peptides in that it only works when complexed with zinc, the zinc-bound form ('zinc-thymulin') is the active molecule.
It sits in the same broad 'thymic peptide' conversation as thymosin alpha-1 and thymosin beta-4 / TB-500, but it is a distinct compound with a distinct, zinc-gated mechanism. Everything below is research context, not medical guidance; thymulin is not an approved therapy.
Key research takeaways
It supports T-cell differentiation and NK-cell development and, in animal models, sensitizes end-organs to hormone signaling (e.g. ACTH, hCG), linking the immune system to the endocrine system.
Thymulin at a glance
PeptidePrices safety rating
6/10 · Not FDA-approved
Mechanism
Nonapeptide thymic hormone secreted by thymic epithelial cells; its biological activity is strictly zinc-dependent (zinc must be bound for the peptide to be active). Promotes T-cell differentiation and NK-cell development and helps balance cytokine signaling; in animal models it sensitizes end-organs to hormone signaling (e.g. greater target-hormone output when combined with ACTH or hCG). Falling thymulin activity is among the earliest measurable markers of zinc deficiency, before serum or red-cell zinc drop.
Research areas
Immune-support and immunosenescence research; T-cell and NK-cell function; neuroinflammation and analgesia research; studied as a marker and mediator of zinc status and of the immune-endocrine link. No approved human therapeutic indication.
Regulatory / research status
Research / preclinical only
Half-life
Very short (on the order of minutes).
Storage
Lyophilized vial: store at -20°C long-term or 2-8°C short-term, protected from light.
Reported side effects
Human safety data is sparse. Activity is strictly zinc-dependent, so effects are inseparable from zinc status. Generally low reported toxicity in animal models, but it should be treated as experimental. Research-use only; not for human consumption.
Endogenous zinc-dependent thymic nonapeptide (FTS); low toxicity in animal models and a benign physiologic profile, but human safety/PK data is sparse and there is no established dose. Activity is inseparable from zinc status; treat as experimental. Safety ratings summarize published clinical data, adverse-event reporting, and regulatory status. How PeptidePrices rates evidence. Research information only, not medical advice.
Study highlights
- Thymulin is a zinc-dependent nonapeptide thymic hormone (also called FTS, facteur thymique sérique). Its biological activity REQUIRES bound zinc, without zinc the peptide is inactive, and declining thymulin activity is one of the earliest measurable markers of zinc deficiency, appearing before serum or red-cell zinc fall.
- It promotes T-cell differentiation and NK-cell development and helps balance cytokine signaling. In animal models it 'sensitizes' end-organs to hormone signaling (e.g. greater target-hormone output when paired with ACTH or hCG), forming a link between immune status and the endocrine system.
- The evidence is predominantly preclinical/mechanistic. Because thymulin's circulating half-life is very short (minutes), research interest centers on supporting the body's own production via adequate zinc rather than injecting the peptide.
- It is not FDA-approved and has no established human therapeutic dose. (Discussed in the 2026 Huberman Lab episode with Dr. Abud Bakri as the under-recognized zinc-dependent thymic hormone.)
Selected references
Related pages