The robbery occurred in the 200 block of S. State Street at about 3:30 p.m., according to police.
A man went into the health store and demanded property from a witness, police said. The offender then escorted the witness into a back room, according to police.
The witness said the thief implied he had a weapon.
The thief then stole items from the store.
No one was hurt.
Area Central Detectives are investigating.