How to stimulate the vagus nerve for Better immunity and parasympathetic function

The Vagus nerve is of major importance in parasympathetic nervous system. 

1) Here's how we can stimulate it.

https://realfarmacy.com/stimulate-vagus-nerve/

2) And a short video to help summarise its function and importance. 

https://youtu.be/gp67EQhNfj8