Ascophyllum nodosum vs Kelp

Side-by-side comparison of medicinal herbs

Herb

Ascophyllum nodosum

Hormonal

Fucus vesiculosus

Hormonal

Ascophyllum nodosum

❌ Not recommended in pregnancy

❌ Not recommended while nursing

Kelp

❌ Not recommended in pregnancy

❌ Not recommended while nursing

Description

North Atlantic brown seaweed; rich in iodine, polysaccharides, and minerals; thyroid and metabolic support.

A brown seaweed rich in iodine and fucoidans, used for thyroid support and as one of the original anti-obesity supplements.

Active Compounds

fucoidan, alginic acid, iodine, fucosterol, laminarin, mannitol

Iodine, Fucoidans, Alginic acid, Fucoxanthin

Traditional Uses

thyroid support, iodine deficiency, skin conditions, weight management

Thyroid support, Obesity, Rheumatism, Digestive aid

Modern Uses

thyroid support, anti-inflammatory, antioxidant, prebiotic

Thyroid hormone support, Anti-obesity (fucoxanthin), Anticoagulant (fucoidan), Prebiotic

Adult Dosage

300-600mg extract daily

500-600mg dried kelp daily (check iodine content)

Contraindications

hyperthyroidism, thyroid medications, iodine allergy, pregnancy large doses

Thyroid disorders, Iodine sensitivity, Anticoagulant therapy, Pregnancy, Heavy metal concerns

Side Effects

thyroid disruption, iodine excess, heavy metal contamination if from polluted sources

Thyroid dysfunction, Acne, GI upset, Heavy metal exposure risk

Drug Interactions

0 known interactions

Reviewed by: HerbAlly Editorial Team, Medical herbalists and healthcare professionals

Sources: WHO Monographs · NCCIH · PubMed · Commission E