Description
Our Liquid RU-58841 comes ready to measure: 50mg/mL of RU-58841 in PEG-400, 30mL per bottle. It’s a nonsteroidal antiandrogen. It’s sold for laboratory research only.
Background on RU-58841
RU-58841 is a nonsteroidal antiandrogen made by Roussel Uclaf in France in the early 1990s. It’s chemically related to nilutamide and was built for use on the skin, to block androgens in hair follicles and oil glands without lowering hormone levels in the blood.
It was later licensed as PSK-3841 (also HMR-3841), but development stopped and it was never approved anywhere. It’s often sold next to SARMs even though it does the opposite at the androgen receptor: it blocks it.
How RU-58841 works
RU-58841 competes with DHT and testosterone for the androgen receptor. When it sits in the binding pocket, the receptor can’t switch on androgen-responsive genes, so the androgen signal in that tissue drops.
It’s meant to act where it’s applied. That’s the difference from 5-alpha-reductase inhibitors such as finasteride, which lower DHT production across the whole body.
Liquid RU-58841 specifications
- Compound: RU-58841
- Also known as: PSK-3841, HMR-3841
- CAS number: 154992-24-2
- Molecular formula: C17H18F3N3O3
- Molecular weight: 369.3 g/mol
- Structure: imidazolidinedione (nilutamide-related)
- Concentration: 50mg/mL
- Volume: 30mL glass bottle (1,500mg total)
- Carrier: USP-grade PEG-400
- Included: graduated 1mL glass pipette
- Purity: 99.31% by HPLC, identity by mass spectrometry
- Tested by: MZ Biolabs, Tucson, Arizona
- SKU: STL-RU-L
- Intended use: laboratory research only
Published studies on RU-58841
Battmann and colleagues reported in 1994 that RU-58841 applied to the skin blocked androgen-driven growth of the hamster flank organ, a standard model for oil glands, with little effect elsewhere in the body.
Pan and colleagues (Endocrine, 1998) tested it on the bald scalp of stump-tailed macaques, a primate model of androgen-related hair loss, and saw regrowth of hair in treated areas. The same paper looked at its effects in prostate cancer cells.
You can read the original papers through this PubMed search at the U.S. National Library of Medicine.
Where RU-58841 fits in the range
In one line, RU-58841 is a topical antiandrogen that blocks the androgen receptor instead of activating it. The compounds researchers most often weigh it against:
- Cardarine is a PPAR-delta agonist studied for endurance and fat burning in mice
- SR-9009 is a REV-ERB agonist that acts on the body clock and muscle metabolism in mice
- MK-677 is an oral ghrelin mimic that raises GH and IGF-1 and isn’t a SARM
- MK-777 is an acetylated version of MK-677 with very little published data
- Ostarine is the most studied SARM, with human trial data on muscle wasting
These are often sold next to SARMs but work through other targets: PPAR-delta, REV-ERB, the ghrelin receptor or androgen blockade. Compare them in our liquid SARMs.
Measuring Liquid RU-58841 accurately
The bottle is 30mL at 50mg per mL (1,500mg total), dissolved in USP-grade PEG-400 and supplied with a graduated 1mL pipette.
Measuring is simple arithmetic: 0.5mL holds 25mg and 0.1mL holds 5mg. Read the pipette at eye level, since PEG-400 is thick and clings to the glass.
Storing Liquid RU-58841
A cool, dark shelf is ideal. Keep the cap on between uses so the solution doesn’t pick up moisture.
Clean and dry the pipette after each use, or keep a separate one for each bottle.
Liquid RU-58841 purity and lab testing
Sports Technology Labs doesn’t test its own products. MZ Biolabs in Tucson, Arizona, does, using HPLC for purity and mass spectrometry for identity. For this listing the posted result is 99.31%.
Scroll through the product photos and the certificate is there, with the test date and the chromatogram.
HPLC and mass spec answer different questions. HPLC tells you what share of the sample is the main compound. Mass spec tells you the compound is the right molecule. A COA with only one of them leaves a gap.
If anything arrives wrong, the 60-day money-back guarantee covers it.
Related to Liquid RU-58841
- Liquid YK-11 10mg/mL, a steroidal SARM ready to measure
- Liquid MK-777 (Acetamoren) 20mg/mL, a GH secretagogue ready to measure
- Liquid RAD-150 (TLB-150) 10mg/mL, an SARM ester ready to measure
- Liquid Andarine (S4) 50mg/mL, an SARM ready to measure
- Liquid SR-9009 (Stenabolic) 20mg/mL, an REV-ERB agonist ready to measure
Browse the full list in our liquid SARMs, or go back to the Sports Technology Labs home page to see every category.
Liquid RU-58841 questions and answers
How much RU-58841 is in a bottle of Liquid RU-58841?
1,500mg: 30mL at 50mg/mL.
Where can I buy Liquid RU-58841?
Right here at Sports Technology Labs. Add it to your cart on this page and check out. Shipping is free on every order.
Is there a discount on Liquid RU-58841?
Yes. Pay with crypto at checkout and you get 15% off your order.
Where is the Liquid RU-58841 lab report?
In the product gallery. MZ Biolabs tested the batch and the posted purity is 99.31%.
What is Liquid RU-58841 dissolved in?
USP-grade PEG-400, a clear, thick solvent widely used in labs.
Get Liquid RU-58841 from Sports Technology Labs
Order Liquid RU-58841 now for $57.99. It’s in stock, it ships free and crypto payments get 15% off at checkout.
Compounds that fit the same study sit in our liquid SARMs.
Sports Technology Labs sells this product for laboratory and in-vitro research only. It isn’t a medicine, food or dietary supplement, and it must not be given to people or animals. The FDA has not evaluated any statement on this page. Buyers must be 21 or older.
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