Extract of algae is often found on the list of ingredients on cosmetic packages, particularly in face,
hand, and body creams or lotions, but the use of algae themselves in cosmetics, rather than extracts
of them, is rather limited.
Milled macroalgae, packed in sachets, is sold as an additive to bath water, sometimes with
essential oils added. Bath salts with macroalgae meal are also sold. Thalassotherapy has come
into fashion in recent years, especially in France. In thalassotherapy, macroalgae pastes, made
by cold-grinding or freeze-crushing, are applied to the person’s body and then warmed under infrared
radiation. This treatment, in conjunction with seawater hydrotherapy, is said to provide relief
for rheumatism and osteoporosis. Mineral-rich seawater is used in a range of therapies, including
hydrotherapy, massage, and a variety of marine mud and algae treatments. One of the treatments is
to cover a person’s body with a paste of fine particles of macroalgae, sometimes wrap them in cling
wrap, and warm the body with infrared lamps.