Red algae, particularly species such as Lithothamnion, are used to support the skeletal system due to their rich mineral content, especially calcium, magnesium, and trace minerals. These minerals are vital for bone health, and red algae-derived calcium is marketed as a plant-based alternative to traditional calcium supplements sourced from limestone or animal bones.

Scientific studies have shown that calcium from red algae is bioavailable and can contribute to bone mineral density. Some animal and human studies suggest that supplementation with red algae-derived minerals can improve bone strength or slow bone loss, particularly in postmenopausal women. For example, a randomized controlled trial published in Phytotherapy Research (2012) found that red algae-derived calcium maintained bone mineral density in postmenopausal women over one year, compared to placebo.

While red algae have not been traditionally used in bone health remedies, their mineral content and the preliminary clinical evidence support their modern use as a supplement for skeletal support. However, longer-term and larger-scale human studies are still needed to confirm efficacy and establish optimal dosing. Overall, the use of red algae for bone health is justified by emerging scientific evidence rather than tradition.