Because bladderwrack grows in the sea, it accumulates and concentrates various minerals and nutrients not readily found in earthbound plants. One of the most important elements found in bladderwrack is iodine. Products such as cosmetics and skin creams may include bladderwrack extract because of its effect on human skin. Many people have reported noticeable improvements to skin conditions such as eczema and acne after applying ointments containing bladderwrack. Some cosmetic companies even claim that regular use of bladderwrack extract can help tighten skin and reduce the appearance of wrinkles and fine lines. There appears to be some scientific evidence to back up many of these claims, although bladderwrack by itself is not considered to be a miracle plant.