Synopsis

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

Seaweed, particularly certain edible varieties like kelp and red algae (e.g., Lithothamnion species), has been studied for its potential benefits to the skeletal system primarily due to its rich mineral content. Seaweed is a notable natural source of calcium, magnesium, and trace minerals, all of which are important for bone health. Some scientific studies have explored the bioavailability of calcium from seaweed and its effect on bone mineral density. For example, Lithothamnion-derived calcium has shown promise in small human and animal studies for maintaining bone mass or slowing bone loss, especially in postmenopausal women. However, the volume and quality of evidence are limited, and results are not always consistent. The unique matrix of minerals and polysaccharides in seaweed may offer additional benefits over standard calcium supplements, but more rigorous, large-scale clinical trials are needed.

Traditional uses of seaweed for bone health exist in some coastal cultures, but these are less documented compared to its general use as a food and remedy for other ailments. Most claims around bone health are based on the nutritional composition of seaweed rather than long-standing folk practices. Therefore, while there is some scientific rationale and preliminary evidence to support the use of seaweed for skeletal health, it is not robust or definitive at this time, resulting in a moderate-low evidence rating.

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