Fucus (Fucus vesiculosus) or sea oak is an alga with flattened and elongated leaves, rich in iodine, which grows along the coasts of the temperate and cold seas of the Northern hemisphere and is found in abundance in the English Channel. Sea oak acts in a particular way on the thyroid, which uses its richness in iodine and microelements for the production of the thyroid hormones thyroxine and triiodothyronine, essential for increasing the basal metabolism, accelerating metabolism and rebalancing the process of synthesis of fats by the our body. Its stimulating action is therefore also useful in all cases of hypothyroidism and related disorders. In addition to fighting overweight, obesity and cellulite, sea oak has numerous other virtues, including: gastroprotective and antiulcerative, natural laxative, antidiabetic, antibacterial, anti-inflammatory and anti-aging.