People have been wearing Jewish amulets going back milenia. Some such items are worn as a commandment like tefillin, which comes from the word meaning ‘prayer’ but in the Torah are called word ot (sign), or zicharon (memorial), and as such are often translated as ‘amulet’. After all, an amulet is just a way to remember G-d and in so doing hope to channel some of His power for a particular purpose.
Many people have been inspired by the notion of walking with an amulet wherever they go that encapsulates so many positive attributes: remembering G-d, protection, and meaning of the verses that go in a mezuzah. There are even antique examples of these mezuzah necklaces that people wore in ages long since passed.
Mezuzahs (literally ‘doorpost’), mentioned in the Torah alongside tefillin are another such amulet, though these have the commandment to be placed on doorways of all Jewish homes and businesses. Putting up the mezuzah scroll with specific Torah verses additionally offers protection within that people are tapping into in new and creative ways.