Evidence supporting the use of: Gamma Linolenic Acid
For the body system: Hair

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Gamma Linolenic Acid (GLA) is an omega-6 fatty acid found in plant oils such as evening primrose oil, borage oil, and black currant seed oil. Its use to support hair health is based on its anti-inflammatory properties and its role in maintaining healthy cell membranes. Some scientific evidence exists for its use in addressing certain hair-related issues, particularly in the context of inflammatory scalp conditions and hair loss associated with hormonal imbalances. Small clinical trials and animal studies have suggested that GLA supplementation may help improve hair texture, reduce hair loss, and alleviate scalp inflammation, likely due to its effect on prostaglandin synthesis and skin barrier function. However, the evidence is limited and not robust. Most studies have small sample sizes, short follow-up periods, or lack rigorous controls. For example, trials using evening primrose oil (rich in GLA) for hair loss in women with polycystic ovary syndrome (PCOS) have shown modest benefits, but larger and more definitive studies are lacking. Similarly, GLA has been explored in the context of atopic dermatitis, where improvement in skin condition may indirectly benefit hair health. Overall, while there is some scientific basis for using GLA to support hair health, the quality and quantity of evidence are not strong. More well-designed, larger-scale human studies are needed to confirm its efficacy and establish clear recommendations for its use in hair health.

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