Sea Moss

Irish moss (Chondrus crispus) is a red seaweed containing sulfated polysaccharides (the carrageenan precursor), iodine, and trace minerals. Popular on social media for thyroid, gut, skin, and immune support. Human clinical evidence is very limited — only 2 small RCTs (<60 adults each, <12 weeks) have examined whole sea moss supplementation, showing modest changes in fasting glucose and stool frequency but without controlling for baseline iodine intake or habitual diet. Most cited benefits come from preclinical (in vitro/animal) studies and compositional analyses, not human RCTs. ⚠️ THYROID SAFETY: iodine content varies dramatically by species, season, and harvest location — unpredictable dosing carries real risk of iodine-induced hypothyroidism or hyperthyroidism, particularly in individuals with Hashimoto's or Graves' disease (documented Jod-Basedow case in 2021). Pregnant or breastfeeding women and those on thyroid medication should avoid without medical supervision. Not equivalent to standardized iodine supplementation. Also a natural source of dietary carrageenan; while whole-seaweed carrageenan is considered safer than isolated food-additive forms, this ingredient remains controversial for individuals with IBD.