Is transient lengthening/improved posture from chiropractor minimal or can it add 3 inches in height? does it hold yrs after you stop getting adjusted

Highly variable: Chiropractic can't actually add to your height, but with improved posture and standing straighter you might appear taller; as to whether it can make you stand 3 inches taller depends on you; if you're really hunched over then it could help you stand 3 inches taller. As to how long it holds, it again depends on the individual. Doing stretches/yoga and making efforts to maintain posture will help.