After a spinal manipulation the levels of cortisol, neurotensin, and oxytocin rise. The manipulation can cause a definite increases in these neurotransmitters and hormones. You're getting more than just a better range of motion when you get a spinal manipulation. You’re getting positive effects on the entire nervous system that are making widespread changes in your entire body. Chiropractic works and now we know why it’s better than pain-killing drugs with side effects.