Poloxamer 333 P103 is a block copolymer of polyethylene oxide and polypropylene oxide with an average molecular weight of 4950. It exhibits antibacterial activity, inhibiting 90% of Mycobacterium avium at a concentration of 1 mg/mL. The compound forms a thermoreversible hydrogel and is used as a food additive, as well as a drug delivery carrier in cosmetics, pharmaceuticals, and tissue engineering.