Comparison of Minoxidil and RU58841

Minoxidil and RU58841 are two different compounds commonly used in the treatment of hair loss, specifically male pattern baldness (androgenetic alopecia). They have different mechanisms of action and characteristics. Here’s a comparison of the two:

1.Mechanism of Action:

  • Minoxidil: Minoxidil is a vasodilator, which means it widens blood vessels. Its exact mechanism in promoting hair growth is not fully understood, but it is believed to increase blood flow to hair follicles, prolonging the growth phase (anagen) of hair and potentially promoting the growth of thicker, longer hair.
  • RU58841: RU58841, also known as PSK-3841, is a nonsteroidal anti-androgen. It works by binding to androgen receptors in the scalp, blocking the effects of dihydrotestosterone (DHT), which is a hormone implicated in hair loss. By inhibiting DHT at the receptor level, RU58841 aims to prevent hair follicle miniaturization and hair loss.
Comparison of Minoxidil and RU58841-Xi'an Lyphar Biotech Co., Ltd


  • Minoxidil: Minoxidil is typically available as a topical solution or foam, and it is applied directly to the scalp. It needs to be applied consistently, usually twice a day.
  • RU58841: RU58841 is also applied topically to the scalp. It is considered a research chemical and is not as widely available as minoxidil. Users often obtain it through specialized suppliers or compounding pharmacies.

3.FDA Approval:

  • Minoxidil: Minoxidil is one of the few FDA-approved medications for hair loss. It is available over-the-counter (OTC) in various formulations.
  • RU58841: RU58841 is not FDA-approved for hair loss treatment. It is primarily used in experimental or research settings, and its safety and efficacy for long-term use in humans are not well-established.

4.Side Effects:

  • Minoxidil: Common side effects of minoxidil include scalp irritation, itching, and dryness. Some users may also experience increased hair shedding initially before seeing positive results.
  • RU58841: Since RU58841 is not as widely studied or regulated as minoxidil, its potential side effects and long-term safety profile are less well-known. Users should exercise caution when using it.


  • Minoxidil: Minoxidil has been shown to be effective in promoting hair growth and slowing down hair loss in many individuals. However, its results can vary from person to person.
  • RU58841: There is limited clinical data on the effectiveness of RU58841 for hair loss, and its efficacy may vary among users. More research is needed to determine its long-term effects.

6.Legal and Regulatory Considerations:

  • Minoxidil: Minoxidil is widely available and considered safe when used as directed. It is regulated by health authorities in most countries and does not require a prescription in many cases.
  • RU58841: The legality and regulation of RU58841 can vary by country. In some places, it may be considered a research chemical or not approved for human use.

In summary, minoxidil and RU58841 are two different compounds with distinct mechanisms of action and regulatory status. Minoxidil is more widely used and has FDA approval for hair loss treatment, while RU58841 is considered a research chemical with less established safety and efficacy data. Individuals considering either of these treatments for hair loss should consult with a healthcare professional and be aware of potential side effects and legal considerations in their region.