Synopsis

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

Seaweed, particularly species such as Laminaria and Ascophyllum nodosum, has been explored for its potential benefits in supporting or treating acne, primarily due to its bioactive compounds. These compounds include polysaccharides (such as alginates and fucoidans), antioxidants, vitamins (A, C, E), and minerals (zinc, selenium, iodine) that are known for their anti-inflammatory, antimicrobial, and skin barrier-supporting properties. Several in vitro and small-scale clinical studies suggest that seaweed extracts can inhibit the growth of Cutibacterium acnes (the bacterium implicated in acne) and reduce inflammatory responses in skin cells. For example, a 2016 study published in the journal Marine Drugs demonstrated that certain brown seaweed extracts could decrease the expression of pro-inflammatory cytokines and reduce sebum production in cultured sebocytes. Additionally, topical formulations containing seaweed extracts have been observed to improve skin hydration and reduce oiliness, which may indirectly benefit acne-prone skin.

However, while the mechanistic rationale is promising, the overall quality and quantity of clinical evidence remain limited. Most studies are either preliminary, involve small cohorts, or lack rigorous controls. There is also a risk of irritation or allergic reaction in sensitive individuals, especially due to the iodine content. As such, while scientific interest exists and early data is encouraging, the evidence does not yet robustly support seaweed as a primary treatment for acne. Further well-designed, large-scale clinical trials are needed to confirm efficacy and safety.

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