Ketoconazole shampoo
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
What is RU-58841?
Non steroidal androgen receptor antagonist. It is a research compound, not an approved medicine.
What to expect, honestly
Some shedding in the first weeks is common as follicles reset. Loss typically settles before anything visibly grows. The earliest fair verdict is around six months — judged on photographs, not memory.
Suitability & safety
For research use only. Not for human or veterinary consumption, and not a drug, cosmetic or medical device. Read the batch documentation and speak to a professional if you are unsure.
Batch & storage
Every bottle is stamped with its batch number, blend date and expiry. Store it cool, dry and out of direct light — this is a compound that degrades, and heat and daylight are what degrade it.
What people actually report.
Unedited accounts from people using this. Individual results and timelines vary.
No reviews here yet. If you've used this, you'd be the first. Tell it straight.
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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
RU-***** 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 this actually is
RU-***** is a research compound, not an approved medicine, and we won't pretend otherwise. What we can be held to is the bottle: we blend it at 5% ourselves in the EU, in small batches, and we print the batch number, the blend date and the expiry on it. For a compound that degrades in time and light, knowing how old yours is matters more than most sellers would like you to think about.
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.
-
MONTHS 6+
An honest verdict
Six months is the earliest point a fair judgement is possible. Compare photographs, not memories.
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 | MinoxidilTopical growth stimulant | Oral finasterideSystemic DHT blocker | Ketoconazole shampooTopical antifungal | Natural topicalsCaffeine, rosemary, saw palmetto | Doing nothingBaseline |
|---|---|---|---|---|---|---|
| Mechanism | ||||||
| What it acts on | The androgen receptor | Potassium channels, blood flow | 5-alpha-reductase. Lowers DHT | Fungus. Mildly, the receptor | Several weak effects. None well mapped | |
| Where it acts | Scalp | whole body | Whole body | Scalp | Scalp | |
| Side effects | ||||||
| No systemic or sexual side effects | NoDesigned to break down before it reaches the blood. No human data proves that it does. | 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 | 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. | NoItching and flaking are common. Mostly the propylene glycol. | YesIt never touches your scalp | PartlyCan dry the scalp with regular use | YesThe gentlest column here. In the rosemary trial, less itching than minoxidil. | Yes |
| What it does | ||||||
| Blocks DHT | Yesfully, at the receptor | NoIt grows hair by a different route entirely | YesLowers DHT at the source | PartlyA weak antiandrogen at best | PartlySaw palmetto is a weak 5-alpha-reductase inhibitor | No |
| An antiandrogen you apply, not swallow | Yes | NoTopical, but not an antiandrogen | NoAn antiandrogen, but a tablet | PartlyTopical, weakly antiandrogenic | PartlyTopical. Weakly, and only through saw palmetto. | |
| Stimulates new growth on its own | NoIt takes the brake off. It adds nothing. | YesThis is the one thing it is for | NoSame as ours: it removes suppression | No | PartlyA little, in small trials. Nothing like minoxidil. | |
| Also treats the scalp itself | No | No | No | YesClears the flaking and inflammation nothing else here touches | 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. | YesApproved for male-pattern hair loss | YesApproved, on prescription | PartlyApproved as an antifungal, not for hair loss | NoCosmetics. Nobody has taken them through approval. | |
| Human evidence behind it | NoNo completed human trials. None. | YesDecades of randomised trials | YesDecades of randomised trials, and the largest measured effect of anything on this table | PartlyA handful of small studies | 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 | YesOver the counter | NoPrescription only. A doctor has to agree. | Partly1% over the counter. 2% is usually a prescription. | YesAny shop, any time | |
| Living with it | ||||||
| If you stop | Loss resumes | Shedding within weeks | Loss resumes | The flaking comes back | Back to baseline | |
| Daily effort | Once a day | Twice a day | One tablet | Two or three times a week | Daily, or every wash | None |
| Cost per month, roughly | €25–50 | €20–60 | €10–20 | €5–10 | €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 largest measured effect of anything here. RU-58841 is a research compound: no approved human use, no completed human trials, and therefore no side-effect rates to quote for it — only the way it was designed. 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 and brand. Speak to a doctor before you start or stop anything.
Questions, answered.
When will I see results?
Most people notice less shedding within the first 4–8 weeks, and new growth from around month 2–3. Give it a full 3–6 months before you judge it.
Why did my shedding get worse at first?
Early shedding is common as follicles reset their growth cycle. It looks like the product is failing. It is usually the opposite — and it settles.
Are there side effects?
Because it stays on the scalp, it avoids the systemic side effects linked to oral DHT blockers. As with anything new, patch-test first and stop if you react.
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.