Zinc Thymulin
A copper-free, non-hormonal scalp peptide. Thymulin is a small thymus-derived peptide that only becomes active when it is bound to zinc. People apply it to the scalp to wake up dormant follicles and push hairs back into their growth phase, often alongside GHK-Cu and PTD-DBM.
Where to buy Zinc Thymulin.
We track Zinc Thymulin across vetted vendors, but none is publicly listing a verifiable price right now. As soon as one does, it shows up here, cheapest first.
Zinc Thymulin
No vetted vendor is publicly listing Zinc Thymulin at a price we can verify yet. We don't show prices we can't stand behind, so this stays empty until one does.
Compare Zinc Thymulin with other peptides →What Zinc Thymulin actually does.
The simple version first, then a little more for the curious. No biochem degree required.
It is thought to nudge resting follicles back into growth and calm the local inflammation that thins hair, without touching your hormones the way finasteride does.
How it works
Thymulin is a nonapeptide that is biologically inactive on its own. It needs a zinc ion to fold into its working shape, which is why it is sold as the zinc-bound complex. In that active form it is studied for signaling at the follicle and modulating local inflammation.
Where it acts
Applied to the scalp, it works locally at the hair follicle rather than spreading through the body. It is studied for reactivating follicles that have gone dormant and for extending the anagen, or active growth, phase of the hair cycle.
What people notice
In the small trial that exists, people saw more fine vellus and intermediate hairs appear in thinning areas over about six months. Changes are gradual and build over months of twice-daily use, not weeks.
Honest caveat: the human evidence is very thin. The headline data comes from one small pilot study on topical zinc-thymulin in androgenetic alopecia, not large controlled trials. It is not an approved medicine and is sold strictly for research use only. None of this is medical advice, talk to a licensed provider before starting anything.
How to take it.
Zinc Thymulin is a topical, applied as a spray or solution directly to the scalp. There are no needles and no reconstitution math. It is run twice daily on the thinning areas, and effects build over months. The routine is below; for stacking and timing, see the full guide.
Start with a clean, dry scalp
Apply to a dry scalp, ideally after it has been washed earlier in the day. You do not need to wash right before each dose, just avoid applying over heavy product or sweat.
Apply to the thinning areas
Spray or dab the solution directly onto the scalp where hair is thinning, then part the hair so it reaches skin, not just the strands. A typical formulation is dosed in the low microgram range per application.
Massage in and let it absorb
Gently work it into the scalp with fingertips and let it dry fully. Leave it on, do not rinse. Many people apply it morning and night, twice daily.
Store it cold
Keep the bottle refrigerated at about 4°C and out of direct light. It is a peptide in solution, so heat and time degrade it. Do not freeze it.
Typical Zinc Thymulin dose: in the published pilot, a 0.0005% zinc-thymulin spray was applied to the scalp twice daily for around six months. Compounded versions are commonly dosed at roughly 10 mcg per millilitre, a few sprays per area, morning and night, run continuously.
How to cycle Zinc Thymulin.
How long people run Zinc Thymulin, when to take a break, and the honest reasoning behind it.
A topical scalp course run over months.
Unlike the injectables that run in loading-then-maintenance blocks, Zinc Thymulin for hair is generally run continuously. Hair growth is slow, and stopping tends to let any gains fade, much like conventional topical hair treatments.
Why continuous rather than cycled? Because the goal is to keep follicles in their growth phase over the long haul. There is no established benefit to taking breaks, and the small safety data we have came from many months of uninterrupted daily use.
- Apply twice daily and keep going; this is a months-long routine, not a short cycle.
- Judge it at around six months, which is roughly when the pilot study assessed changes.
- Expect gains to fade if you stop, as with most topical hair treatments. If you plan to stop, talk it through with a provider.
Want the full picture, on and off periods, the washout, stacking, and keeping your results? Read how peptide cycling works →
What's actually in the vial.
We haven't yet found a vendor publishing a lab certificate for Zinc Thymulin that we can link to directly. We don't post purity numbers we can't source. When a vendor publishes a real Zinc Thymulin COA, it'll show up here.
What people pair it with.
Zinc Thymulin is rarely run alone. For hair, it is most often layered with other topical scalp peptides that hit different parts of the problem.
Topical hair stack
The combination the hair community reaches for most. GHK-Cu supports the follicle and scalp, PTD-DBM targets the Wnt pathway tied to follicle signaling, and Zinc Thymulin works on reactivating dormant follicles. All three are topical.
View stack →Follicle & scalp
A simpler two-peptide scalp blend, often sold pre-mixed in a single dropper. GHK-Cu adds the copper-peptide angle for scalp and collagen on top of the thymulin base.
View stack →Topical add-on
Some people layer Zinc Thymulin alongside a conventional topical like minoxidil, since it is non-hormonal and works through a different mechanism. Spacing the applications is sensible; a provider can advise.
View stack →In the same corner.
Other hair and scalp peptides people compare against Zinc Thymulin.
Questions, answered straight.
Is Zinc Thymulin legal?
Zinc Thymulin is not an approved drug and is not sold for human use. The vendors we compare offer it strictly for research use only. It is non-hormonal and is not specifically named on WADA's prohibited list, but rules vary by country and by sport, so check what applies where you are.
What does research use only actually mean?
It means the product is sold for laboratory and research purposes, not as a supplement or medicine for people. It has not been reviewed or approved for human use by the FDA. We aggregate prices and public lab data so you can see the landscape; what you do with that is between you and a licensed provider.
How do I store it?
Keep it refrigerated at about 4°C and out of direct light, since it is a peptide in solution rather than a dry powder. Do not freeze it. Used this way, a compounded bottle is typically good for a few weeks to a couple of months; check your vendor's guidance.
How long until it works?
Slowly. The pilot study ran for about six months before assessing changes, and people generally treat it as a months-long commitment with twice-daily use. It is not an overnight fix, and consistency matters more than dose.
Do I need to inject it?
No. Zinc Thymulin is a topical scalp treatment, applied as a spray or solution and massaged into the skin. There are no needles, no reconstitution, and no dosage-calculator math. Just apply it to the thinning areas, twice daily, and let it absorb.