Sea Moss (Irish Moss) for Skin Health
There is no clinical evidence that sea moss (Irish moss, Chondrus crispus) improves skin health, whether taken orally or applied topically. Marketing claims about collagen support and "92 minerals" are extrapolated from its nutrient content, not demonstrated in any human study.
Why this grade7-layer evidence engine
The grade is Unverified because not a single human trial has tested sea moss for any skin outcome—acne, hydration, wrinkles, dermatitis, or wound healing. A 2024 systematic review of the entire Chondrus genus (PMID 38248672) found only one clinical study in the literature (an iota-carrageenan nasal spray for COVID-19, unrelated to skin); its only skin-relevant data came from a mouse atopic-dermatitis model of a different species. A 2023 review of 25 human seaweed trials (PMID 37545570) found zero that examined skin endpoints.
The remaining study (PMID 36355018) only measured the chemical stability of cosmetic formulations containing C. crispus extract, not any effect on real skin. With no efficacy data, mainstream sources withhold endorsement: the NIH LactMed monograph states plainly that 'no medicinal value has been proven,' and Mayo Clinic, Harvard, and the dermatology and family-medicine societies do not address sea moss for skin at all.
Regulators raise safety concerns rather than support. The FDA recognizes only the derived additive carrageenan as a food thickener, not whole sea moss as a supplement, and EFSA warns that seaweed intake can push iodine and heavy-metal (cadmium, arsenic) exposure above safe limits. High, variable iodine also poses thyroid risks and interacts with medications such as levothyroxine.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.427
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
- tier_strict_requirement_check — | C→U 因 scope.conflation_risk=true 且 L11 獨評較低 (B7-2 tier cap)
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status