What Is RU58841?

RU58841 is an experimental non-steroidal anti-androgen research compound originally synthesized by Roussel Uclaf in the 1980s. It was developed to investigate topical androgen receptor antagonism with a focus on scalp-specific applications. Unlike systemic anti-androgens, RU58841 is designed for topical application, where it acts locally on androgen receptors in the skin and hair follicles without significant systemic absorption — a property that has made it a subject of ongoing androgenetic alopecia research.

RU58841 competitively binds to androgen receptors at the follicular level, potentially preventing dihydrotestosterone (DHT) from binding and triggering the follicular miniaturization process associated with androgenetic alopecia. It remains one of the most researched topical anti-androgen compounds in the hair loss research community despite never progressing to FDA approval.

All products are sold strictly for laboratory and research purposes only. RU58841 is not approved by the FDA for human consumption or topical use.

RU58841 Product Specifications

Why Researchers Choose Our RU58841

Who Purchases RU58841 for Research?

RU58841 is purchased across a broad range of research contexts including:

• Dermatology researchers studying topical androgen receptor antagonism
• Hair loss researchers investigating androgenetic alopecia mechanisms
• Labs comparing topical anti-androgens vs systemic DHT inhibitors
• Researchers studying follicular miniaturization and DHT binding
• Biohackers running documented scalp application and biomarker protocols
• Independent researchers comparing RU58841 with finasteride and minoxidil

All purchases are for laboratory and research use only. RU58841 is not approved by the FDA for human consumption or topical therapeutic use and is not sold as a cosmetic or medical product.

How Our RU58841 Compares

Frequently Asked Questions — RU58841

• Is RU58841 legal to buy in the US?

  Yes. RU58841 is legal to purchase in the United States for research purposes. It is not a scheduled controlled substance under the DEA Controlled Substances Act and is not classified under any current SARM or anti-androgen drug scheduling legislation.

  However, RU58841 is not FDA-approved for human use in any form — topical, oral, or otherwise. It is not legal to sell as a cosmetic, dietary supplement, or therapeutic product and cannot be marketed with health claims. It must be purchased strictly for legitimate laboratory or scientific research use. Always verify the current regulatory status in your state before ordering.

• What is RU58841 used for in research?

  RU58841 is primarily studied as a topical anti-androgen in the context of androgenetic alopecia and scalp androgen receptor research. Specific research areas include:

  • Topical androgen receptor antagonism and scalp-specific binding studies
  • Androgenetic alopecia and DHT-mediated follicular miniaturization research
  • Comparisons between topical and systemic anti-androgen compounds
  • Skin androgen receptor density and sensitivity studies
  • Pharmacokinetic studies on topical absorption and systemic exposure levels
  • Combination anti-androgen protocol research alongside minoxidil and finasteride

  All research use must comply with applicable institutional and regulatory guidelines. RU58841 is not approved for any therapeutic or cosmetic application.

• How does RU58841 differ from finasteride and minoxidil?

  RU58841, finasteride, and minoxidil address hair loss research through entirely different mechanisms:

  • RU58841: A topical androgen receptor antagonist. Competes directly with DHT at the androgen receptor in hair follicles. Acts locally at the application site. Not FDA-approved. Research compound only.
  • Finasteride: An FDA-approved oral 5-alpha reductase inhibitor. Reduces systemic DHT production by blocking the enzyme that converts testosterone to DHT. Systemic action with known systemic side effects.
  • Minoxidil: An FDA-approved topical vasodilator. Mechanism in hair growth is not fully understood but is believed to involve potassium channel opening and increased follicular blood flow. Does not directly target androgen receptors or DHT.

  RU58841 is unique in that it targets the androgen receptor directly at the follicular level without the systemic DHT suppression associated with finasteride — a distinction that drives significant research interest in its topical selectivity profile.

• What solvent is used in the RU58841 solution?

  Our RU58841 solution is formulated using a pharmaceutical-grade ethanol and propylene glycol carrier base — the same vehicle used in the majority of peer-reviewed RU58841 research studies. This formulation is standard for topical research protocols and is optimized for compound stability and skin penetration studies.

  The solvent composition is listed on the product label and Certificate of Analysis. If your research protocol requires a specific vehicle formulation or alternative solvent system, contact us prior to ordering to discuss available options.

• How do I verify the purity of your RU58841?

  Every batch of RU58841 we stock has a corresponding Certificate of Analysis (COA) issued by an independent, US-accredited third-party laboratory. We do not use in-house testing or recycle documentation across batches.

  Each COA includes:

  • HPLC purity percentage confirming compound concentration at 50mg/ml
  • Mass spectrometry identity verification matching the correct molecular weight of RU58841
  • Batch lot number that matches the label on the bottle you receive
  • Laboratory name and contact information for independent verification

  COAs are available for download directly on the product page without requiring an account or prior purchase. If your bottle’s lot number does not match the posted COA, contact us immediately for resolution.

• How fast does RU58841 ship and what are the delivery options?

  Orders placed before 2pm EST on business days ship the same day. Orders placed after 2pm EST or on weekends ship the next available business day.

  • Standard shipping: 2–4 business days via USPS or UPS depending on destination
  • Express shipping: 1–2 business days, selectable at checkout
  • Overnight delivery: Available on request for qualifying orders

  All orders are shipped in plain, discreet packaging with no product labeling visible externally. A tracking number is emailed immediately upon dispatch. We ship to all 50 US states. International shipping is not currently available.

• What is the shelf life and storage requirement for RU58841?

  RU58841 solution requires more careful storage than most research compounds due to its sensitivity to heat and light:

  • Short-term storage (up to 3 months): Room temperature (15–22°C / 59–72°F), away from direct sunlight and heat sources. Keep bottle tightly sealed when not in use.
  • Long-term storage (3 months and beyond): Refrigerate at 2–8°C (36–46°F) in a sealed, light-protected container. Do not freeze.
  • Powder form: Store in a cool, dry, dark location. Stable for 24–36 months when properly sealed.

  RU58841 solution is more susceptible to degradation than most other research compounds when exposed to elevated temperatures. Always check for visible discoloration or precipitation before use. Each bottle is labeled with a manufacturing date and expiry date.

• Can I buy RU58841 in bulk quantities?

  Yes. Bulk and wholesale pricing is available for research institutions, private laboratories, and verified researchers requiring quantities above standard catalog listings. Both solution and powder formats are available for bulk ordering.

  Volume discount tiers are applied automatically at checkout for qualifying order sizes. For institutional purchase orders, custom invoicing, or high-volume requirements, contact us directly via the enquiry form with the following details:

  • Required quantity and preferred format (solution or powder)
  • Intended research application or institutional affiliation
  • Preferred delivery timeline and location

  All bulk orders are subject to the same independent third-party verification standards and include full COA documentation for every batch supplied.