Why you are losing your hair: DHT, the androgen receptor, and what actually stops it
Not stress, not your shampoo, not the hard water - in the overwhelming majority of men, one androgen acting on follicles that...
Folliva Labs
4.988 reviewsRU58841 Topical Solution
Concentration
Blocks DHT at follicle receptors
Janoshik, COA Tested
>99% purity verified
No prescription
What is RU58841?
RU58841 is an experimental research compound studied for its interaction with androgen receptors. It is not an approved medicine or hair-loss treatment. For research use only.
What to expect, honestly
Hair biology does not change overnight. RU58841 is researched for its potential to interfere with androgen-receptor signalling the pathway associated with the gradual miniaturisation of susceptible hair follicles.
Months 1–2: Watch for early changes
During the first month or two, changes in hair shedding may be noticed. Results can vary, so no outcome can be guaranteed.
Months 3–6: Look at hair quality
Over the next few months, it may become easier to see whether existing hair looks thicker, stronger, or fuller. This does not create new follicles. Use consistent photos to compare any changes over time.
The standard is patience, not hype.
Hair cycle changes take time. Compare consistent photographs and documented observations over months, not days. This is an experimental research compound, not an approved treatment, and individual outcomes cannot be predicted.
Suitability & safety
This product is intended for laboratory research only, not for human or animal use. Please read the batch details and storage instructions before handling. If you are unsure, ask a qualified professional.
Batch & storage
Every bottle includes a batch number, blend date, and expiry date for easy traceability. Store in a cool, dry place away from direct sunlight. Heat and light can affect the stability of the compound.
Disclaimer
This product is sold as a raw material for further formulation and research. It does not include usage instructions or claims regarding specific outcomes. This product is a raw material and not sold for human use/consumption. If we discover a customer uses this product for human use/topical use the customer will be permanently banned off the website. This is a raw material and under no circumstances may be used for human consumption
REVIEWS
What people actually report.
Unedited accounts from people using this. Individual results and timelines vary.
4.9
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jakub9 July 2026, 6:40 pm
Great service, package here in 3 days
Verified buyer
Folliva Labs repliedCheers, glad it turned up quick.
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Sven9 July 2026, 1:05 am
tried loads of stuff over the years and this is the first that actually held the line
Verified buyer
Folliva Labs repliedGlad it stuck for you where the others didnt. Cheers.
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Youssef K.8 February 2026, 12:34 pm
Took about two weeks to turn up and the tracking sat frozen for days, was getting annoyed ngl. product itself is good but the wait sucked
Verified buyer
Folliva Labs repliedReally sorry about that one. It got stuck at customs and sat far too long. We sent you a second bottle free straight away. Anytime a tracking number stops moving for a few days just email us and we sort it.
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Emre J.7 July 2026, 11:31 pm
package took a bit longer but got here fine
Verified buyer
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Finn G.3 July 2026, 5:56 pm
stopped my recession dead. wish i found this years ago
Verified buyer
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Henrik D.26 May 2026, 7:43 pm
legit seller, fast delivery
Verified buyer
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sander8812 May 2026, 11:32 pm
my barber noticed the temples filling in before i did lol
Verified buyer
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Julius Kaiser3 May 2026, 1:29 pm
quick delivery cheers
Verified buyer
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Karim2 May 2026, 3:45 am
quik and easy, will order again
Verified buyer
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Rasmus Z.28 April 2026, 8:59 am
came off fin because of the sides, no sides with this and my hairline is holding. relieved honestly
Verified buyer
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HOW IT WORKS
What DHT does.
Not stress. Not your shampoo. Not the water. In a genetically susceptible scalp, one hormone repeats the same instruction every growth cycle — and every time, the hair comes back a little thinner. Here is the chain, and where this breaks it.
- 01
DHT reaches the follicle
Testosterone converts into DHT. In a susceptible scalp it binds to androgen receptors inside the follicle. The receptor is the lock. DHT is the key.
- 02
The follicle shrinks, cycle by cycle
Every time that key turns, the growth phase gets shorter. Hair returns finer, shorter, weaker. This is miniaturisation — and it runs quietly for years before a mirror admits it.
- 03
RU58841 occupies the lock
It is a topical androgen receptor antagonist. It sits in the receptor so DHT cannot deliver its instruction — on the scalp, at the exact place the damage happens.
- 04
It stays where you put it
Applied to skin, it is designed to act locally — rather than lowering DHT across your entire body the way a pill does.
Why waiting is the expensive part
A miniaturised follicle can still recover. A follicle that has finished the process cannot. Every cycle you wait, more of the first group quietly joins the second. That isn't a sales tactic. It's arithmetic.
Why minoxidil alone isn't enough
Minoxidil pushes growth. It does nothing to the signal causing the loss. It is the accelerator, not the brake — you end up growing hair into a headwind.
WHAT TO EXPECT
Nothing happens immediately. That's normal.
Hair moves on a biological clock, not a marketing one. Here is the honest sequence — including the part that makes most people quit too early.
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WEEKS 0–4
Baseline — and maybe a shed
Take your first photographs. Some people shed more in the early weeks as follicles reset their cycle. It reads like failure. It usually isn't.
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MONTHS 1–2
The shedding settles
Loss slows before anything grows. This is the stage most people never get past, because they quit in week three.
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MONTHS 3–4
First new growth
Fine, pale hairs at the hairline and temples. Easy to miss without your baseline photo — which is exactly why you took it.
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MONTHS 6+
An honest verdict
Six months is the earliest point a fair judgement is possible. Compare photographs, not memories.
MECHANISM COMPARISON
The options, side by side.
The common ways men treat male-pattern hair loss, compared on mechanism, side effects, evidence and cost.
| Feature | RU-58841Topical antiandrogen | CB-03-01Clascoterone, topical antiandrogen | PyrilutamideKX-826, topical antiandrogen | MinoxidilTopical growth stimulant | Oral finasterideSystemic DHT blocker | Ketoconazole shampooTopical antifungal | GHK-CuCopper peptide, scalp support | Natural topicalsCaffeine, rosemary, saw palmetto | Doing nothingBaseline |
|---|---|---|---|---|---|---|---|---|---|
| Mechanism | |||||||||
| What it acts on | The androgen receptor | The androgen receptor | The androgen receptor | Potassium channels, blood flow | 5-alpha-reductase. Lowers DHT | Fungus. Mildly, the receptor | The scalp skin itself. Not the hormone | Several weak effects. None well mapped | |
| Where it acts | Scalp | Scalp. Broken down there by design, but measurable amounts still reach the blood | Scalp, by design | Scalp. Some absorption | Whole body | Scalp | Scalp | Scalp | |
| Side effects | |||||||||
| No systemic or sexual side effects | PartlyDesigned to break down before it reaches the blood. No human data proves that it does. | PartlyBuilt to break down in the skin, but blood levels measured for their scalp solution are similar to the acne cream's, so a smaller treated area is not a safety argument. In the acne studies 3 of 42 had brief adrenal suppression that cleared after stopping. | PartlyBuilt to act locally. In the trials, safety was no different from placebo. The data is still thin. | YesNot a hormonal drug. Rare heart-rate effects at high doses. | NoLower libido and erectile problems in a minority of men. Most recover after stopping. Some report that they did not. | YesTopical, barely absorbed | YesA topical peptide. It does nothing to hormones, for better or worse. | YesNothing here reaches your bloodstream in any amount that matters | Yes |
| No scalp irritation | PartlyThe alcohol carrier can dry or sting. That is the vehicle, not the compound. | PartlyIn the hair trials local reactions matched the placebo liquid, but the placebo was the same carrier without the drug. The carrier is glycol-heavy and can dry the skin. | PartlyUsually mild, but it does not suit everyone | NoItching and flaking are common. Mostly the propylene glycol. | YesIt never touches your scalp | PartlyCan dry the scalp with regular use | YesGenerally well tolerated on skin. Patch-test anyway. | YesIn the rosemary trial, less itching than minoxidil. | Yes |
| What it does | |||||||||
| Blocks DHT | YesAt the receptor. A non-steroidal molecule. | YesAt the receptor. Same target, a steroidal molecule. | YesAt the receptor. Same target, non-steroidal like RU-58841. | NoIt grows hair by a different route entirely | YesLowers DHT at the source | PartlyA weak antiandrogen at best | NoNot an antiandrogen. It does nothing to DHT. | PartlySaw palmetto is a weak 5-alpha-reductase inhibitor | No |
| An antiandrogen you apply, not swallow | Yes | Yes | Yes | NoTopical, but not an antiandrogen | NoAn antiandrogen, but a tablet | PartlyTopical, weakly antiandrogenic | NoTopical, but not an antiandrogen at all | PartlyTopical. Weakly, and only through saw palmetto. | |
| Stimulates new growth on its own | NoIt takes the brake off. It adds nothing. | NoIt takes the brake off. It adds nothing of its own. | NoSame route. It removes suppression. | YesThis is the one thing it is for | NoSame idea: it removes suppression | No | NoIt looks after the scalp. It does not push growth. | PartlyA little, in small trials. Nothing like minoxidil. | |
| Also works on the scalp itself | No | No | No | No | No | YesClears the flaking and inflammation. The only antifungal here. | YesThis is the whole job of it: the condition of the skin your follicles grow from | PartlySome anti-inflammatory effect. It is not an antifungal. | |
| Evidence and approval | |||||||||
| An approved medicine for hair loss | NoA research compound. No approved human use, anywhere. | NoThe same molecule has been an approved 1% acne cream in the US since 2020, but nothing containing it is approved for hair loss anywhere. Another company is expected to file in 2027. | NoA research compound. No approved use, anywhere. The manufacturer is heading for a filing in China. | YesApproved for male-pattern hair loss | YesApproved, on prescription | PartlyApproved as an antifungal, not for hair loss | NoA peptide sold in cosmetics. No medicine containing it is approved anywhere. | NoCosmetics. Nobody has taken them through approval. | |
| Human evidence behind it | NoNo completed human trials. None. | YesTwo Phase 3 studies, 1,465 men, twelve months. Run by the company taking it through approval, on their formulation, not ours. | PartlyPhase 3 trial data at 0.5% and 1.0%, which puts it ahead of most topicals. The results are the manufacturer's and are not yet published. | YesDecades of randomised trials | YesDecades of randomised trials, and the longest evidence base of anything on this table | PartlyA handful of small studies | PartlyReal human data, but in skin and wound healing. What exists for hair is thin. | PartlyOne small trial matched rosemary oil to 2% minoxidil. Caffeine has a few. That is all of it. | |
| Available without a prescription | YesOnly because there is no approved use to prescribe | YesNo approved hair-loss version to prescribe. The acne cream made from the same molecule is prescription only. | YesSame reason again. There is no approved version to prescribe, anywhere. | YesOver the counter | NoPrescription only. A doctor has to agree. | Partly1% over the counter. 2% is usually a prescription. | YesNo approved medicine here to prescribe | YesAny shop, any time | |
| Living with it | |||||||||
| If you stop | Loss resumes | Loss resumes | Loss resumes | Shedding within weeks | Loss resumes | The flaking comes back | The scalp goes back to how it was | Back to baseline | |
| Daily effort | Once a day | Twice a day | Once a day | Once or twice a day | One tablet | Two or three times a week | Once a day | Daily, or every wash | None |
| Cost per month, roughly | €40–50 | €145 at 2.5%, €230 at 5% | €60–90 | €20–60 | €10–20 | €5–10 | €90 | €10–25 | €0 |
A comparison of mechanisms, not medical advice. Minoxidil and finasteride are approved medicines with decades of randomised trials behind them, and finasteride has the longest evidence base of anything here. RU-58841, CB-03-01 and pyrilutamide are research compounds: none of them is an approved hair-loss medicine today. The Phase 3 figures quoted for clascoterone come from the formulation another company is taking through approval, not from ours, and no cortisol data from those hair trials has been published. The pyrilutamide trial results come from the manufacturer and are not yet published. GHK-Cu is a copper peptide included here as scalp support, not as a regrowth treatment. The natural column covers topical caffeine, rosemary oil and saw palmetto, where the human data is real but thin. Prices are rough monthly estimates and vary by dose, bottle size and brand, and each assumes the routine on that product's own page. Speak to a doctor before you start or stop anything.
What else the lab makes.
RU58841 Topical Solution
4.9 (88)·5/8% · 30/50/100 ml
Occupies the androgen receptor so DHT cannot deliver its signal to the follicle.
This is the cause, not the symptom. On its own it will not push a dormant follicle back into growth.
From €39,99
View
Pyrilutamide 0.5% (KX-826)
4.6 (16)·0.5% w/v · 30 mL
A newer topical androgen-receptor antagonist. Different molecule, same target as RU-58841.
For people who do not tolerate RU. Run one blocker or the other, not both.
€90,00
Waitlist
CB-03-01 2.5/5% (Clascoterone)
2.5/5% · 50 ml
Blocks the androgen receptor at the follicle, then breaks down in the skin into an inactive form.
The only one here that finished phase 3. Clascoterone sold much cheaper elsewhere is usually weaker than the label says.
From €129,00
Waitlist
Minoxidil 5%
4.6 (25)·5% · 60 mL
Extends the growth phase so follicles stay active longer. It does nothing to the hormone driving the loss.
Pairs with a blocker, never replaces one. Stop it and the growth it borrowed goes back.
€60,00
Waitlist
Ketoconazole Shampoo
An antifungal wash that handles the flaking and irritation sitting underneath a lot of shedding.
Two or three washes a week, alongside a blocker. It is not a blocker itself.
€29,99
Waitlist
GHK-CU Copper Peptide Spray
4.5 (13)·Copper peptide · 30 mL
A copper peptide that works on the condition of the scalp itself. Not an antiandrogen; it does nothing to DHT.
For scalp quality. On its own it will not hold a receding hairline.
€50,00
Waitlist
Natural Hair Regrowth Serum
4.6 (13)·Topical · 50 mL
Caffeine, rosemary and botanical oils. Scalp support, and the mildest thing in the range.
A leg of the routine, not the whole table. It does not block DHT.
€60,00
Waitlist
FAQ
Questions, answered.
When will I see results?
Six months is the earliest point at which a fair judgement is possible, and it has to be made against photographs, not memory. Anything before that is mood. The month-by-month timeline is here.
Why did my shedding get worse at first?
A shed somewhere in weeks two to eight is a well-documented pattern with anything that pushes follicles to reset their cycle — hairs already on their way out leave together instead of gradually. It looks exactly like failure, and it is where most people quit. If it is dramatic, or your scalp is sore, stop and ask someone.
Are there side effects?
What gets reported: scalp irritation, dryness and flaking, redness where it is applied. Most of that tracks the carrier rather than the compound. What nobody can give you is a real safety profile — the long-term human trials were never run. Patch test before it goes near your head, and stop if you react. More here.
How do I know it's genuine?
We blend it ourselves in the EU — it is not rebottled, not dropshipped, and it does not sit in a warehouse. Every bottle carries its batch number, blend date and expiry, so you always know how old the thing in your hand is. RU-58841 degrades with time; a fresh batch matters more than most people realise.
Shipping and returns?
Shipped from the EU, usually 3–5 days. Unopened bottles can be returned within 14 days.
Science articles
Read before you start.
What the research actually says about hair loss, DHT, and the compounds people reach for.
