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A user is questioning if Aveda composition oil promotes hair growth or blocks it, listing its ingredients. They are experiencing severe hair thinning and are unsure if they should continue using the product.

The conversation discusses the potential of long-chain unsaturated fatty acids, like oleic and linoleic acid, as an additional treatment for hair loss, which may inhibit the enzyme responsible for converting testosterone to DHT and promote hair growth. Users humorously suggest using oils topically and discuss other hair loss treatments, but the main focus is on the science behind fatty acids and their role in hair health.

Saw palmetto's fatty acids, particularly lauric and linoleic acids, inhibit enzymes linked to hair loss, while sterols like beta-sitosterol are less effective due to poor absorption. The conversation questions which specific compounds in saw palmetto contribute to its anti-androgenic effects.

A serum with oleic and palmitoleic acids shows promise for hair regrowth in mice, but its effectiveness in humans is unproven. Minoxidil and finasteride remain the recommended treatments.

Oleic acid and ethanol are being considered for hair regrowth, with some users planning to self-experiment. There is skepticism about their effectiveness, and ongoing use of treatments like finasteride and minoxidil is mentioned.