Celliant is a brand-name synthetic polymer bicomponent fiber made from polyethylene terephthalate with optically active particles embedded into the core. Hologenix LLC, the company that markets the fiber, paid for a single study that claims it increases oxygenation in body tissue and demonstrated to reduce minor aches and pains. Initially marketed as Holofiber, Hologenix changed the name to Celliant to avoid confusion about the nature of the core of its fiber. Celliant is claimed to interact with electromagnetic emissions (e.g. infrared light) produced by the human body to achieve the increased oxygenation.
Because of oxygenation's performance benefits, Celliant is being used in products by athletic apparel manufacturers like Saucony and Reebok. Celliant is currently being used in bedding, apparel, medical, and veterinary products.
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