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Rob (PHH)

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Beta-sitosterol is a phytosterol found in almost all plants. It is used for its purported ability as a 5α-reductase inhibitor. Beta-sitosterol is sold as an ingredient and by itself as a DHT blocker and supporter of hair growth.

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Key insights:

  • The in vitro evidence shows that beta-sitosterol can inhibit 5α-reductase; however, the only clinical studies that we could find have used beta-sitosterol in combination with other ingredients, so it is not possible to know if these effects are due to beta-sitosterol or other ingredients.
  • There does not appear to be any clinical evidence to suggest that beta-sitosterol alone can improve hair loss. However, some studies include beta-sitosterol as an ingredient in either supplements or topicals.
  • Our experience tracking members: Beta-sitosterol by itself is not enough to improve hair loss outcomes.
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