The vaccine is still experimental according to the FDA. They released it on an EUA (Emergency Use Authorization). Anyone that tells you different is a liar or a sheeple that won't do their own research.

Experimental coronavirus vaccine highly effective

The FDA issued an Emergency Use Authorization for Moderna to make the vaccine available for the prevention of COVID-19 in adults on December 18, 2020.

Why is the COVID-19 vaccine considered experimental?

Vaccines that receive EUA are considered experimental until the FDA formally approves it. It is possible that a rare side effect will be found after mass vaccination allows a longer term of observation on a larger number of people, but most side effects are picked up in the first several months after vaccination.