Seaweed. The stem of the plant is used.It contains large amounts of mucilage and minerals, including iodine which appears in variable amounts that can be significant, in such a way that it may be a cause a hyperthyroidism-like disease (anxiety, insomnia, tachycardia, palpitations).It may also contain heavy metals, being a species of seaweed with a high ability of contamination by toxic products. The commission E of the German Health Ministry has not approved any clinical indication, discouraging its use. At latest update no published data on excretion into breast milk were found. However, there is information from other algae whose consumption is known to increase iodine levels in the plasma and breast milk.There have been reports of hypothyroidism in infants whose mothers have included in their diet important quantities of seaweed. There is no evidence of effectiveness on increasing milk production. The most effective method to increase milk production should be done by strengthening maternal self-confidence, evaluate and correct problems along with an effective support to breastfeeding mothers.