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Sea Moss Research
Mostly mechanism / observationalLimited safety
5 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Sea Moss studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality studies published 2012–2024.
Based on 5 studies
Confidence
Low
Active research area
4 studies in the last 5 years
201220182024
1Review2012
A clinical review explicitly names excess seaweed consumption as a source of iodine overload that can cause hypo- or hyperthyroidism — the core safety concern with sea moss.
Seaweed was the single strongest dietary contributor to iodine exposure and a measurable route of heavy-metal intake — underscoring sea moss's safety, not efficacy, profile.
Ficheux AS et al. · J Trace Elem Med Biol (2023)
Seaweeds were the strongest contributor to dietary iodine, providing up to ~33% of total iodine exposure
Seaweeds also contribute to dietary exposure to lead, cadmium, inorganic arsenic and mercury (lead up to ~3.1% of total dietary exposure)
Supports the heavy-metal and iodine-load cautions for edible seaweed products
Isolated carrageenans from a related Chondrus species slowed cancer-cell growth in a dish — an in-vitro result, not evidence that eating sea moss treats anything.
Tiasto VA et al. · Mar Drugs (2022)
Purified carrageenan oligosaccharides from Chondrus armatus showed antiproliferative effects on cultured gastrointestinal cancer cell lines (IC50 ~184-405 μg/mL)
Effect was via cell-cycle arrest and apoptosis induction in cell culture
Used an isolated compound from a related species, not consumable sea moss
Carrageenans from red seaweeds (including Chondrus) suppressed viral particles in cell assays — an in-vitro antiviral observation, not a human immune benefit.
Shulgin A et al. · Heliyon (2024)
Sulfated carrageenans, including λ-carrageenan from Chondrus armatus, suppressed HIV-1-based lentiviral transduction in cultured cells at non-toxic concentrations
Antiviral potency varied with polysaccharide structure
Relevant to topical/microbicide research on isolated carrageenan, not oral sea moss for immunity