Adopted from the following great insight shared by Simon Sinek from his book Leaders Eat Last

1) Oxytocin is the fulfillment related chemical that flows through our veins.

2) Oxytocin flows when we get fulfillment by doing something selflessly.

3) Oxytocin can help increase immunity and fights stress

4) The flow of oxytocin cannot be tricked and true fulfillment needs to happen for this to flow.