Evidence supporting the use of: Phaeophyceae
For the health condition: Hair (loss or thinning)

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Synopsis

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

Phaeophyceae, commonly known as brown algae (including species such as Laminaria, Ascophyllum, and Fucus), have been investigated for their potential benefits in supporting hair health, particularly with respect to hair loss or thinning. The key bioactive component of interest is fucoidan, a sulfated polysaccharide found in brown seaweeds. In vitro and animal studies suggest that extracts from Phaeophyceae may promote dermal papilla cell proliferation, improve blood circulation in the scalp, and inhibit 5-alpha-reductase, an enzyme involved in androgenic alopecia (male pattern hair loss).

Some cosmetic and nutraceutical products include brown algae extracts, claiming to stimulate hair growth or reduce hair loss. For example, a 2018 study (J Cosmet Dermatol) found that topical application of a brown seaweed extract (including Laminaria digitata and Ascophyllum nodosum) improved hair density and thickness in a small human trial. However, the majority of published evidence is preclinical, small-scale, or industry-sponsored, and robust, large-scale human clinical trials are lacking.

Historically, there is little evidence that Phaeophyceae were used in traditional medicine specifically for hair loss. The interest is primarily modern and driven by research into bioactive compounds in seaweeds. Therefore, while there is some scientific rationale and preliminary evidence, the overall strength of evidence remains modest (rated 2 out of 5).

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