Povidone (polyvinylpyrrolidone) is a synthetic water-soluble polymer. It serves as a binder and forms films. Supplement makers add it to tablets as a binder, suspending agent, or disintegrant. The polymer has no nutritional or therapeutic role. It is an inactive excipient, not an active supplement.
People do not take povidone on its own for health. You see it on ingredient lists as an inert component that holds tablets together or keeps powders mixed. There is no dietary reason to consume povidone separately.
At typical excipient levels, povidone raises no significant safety concerns. If you have an allergy to synthetic polymers or take high-dose oral drugs where absorption matters, ask a pharmacist before switching formulations. Excipients can occasionally alter how a drug releases.