From the peer-reviewed scientific journal, the Journal of Vertebral Subluxation Research (JVSR), comes a very large literature review study showing the multiple benefits of chiropractic care on people who are not suffering from pain or other obvious problems. 

This review looked at more than 20 studies involving subjects who were specifically described as, asymptomatic, healthy, normal, or free from physical injury.  In addition, an equal number of studies were found also documenting objectively measured health benefits in subjects who had no symptomatic presentation.

The results of this large review showed measurable objective improvements in range of motion, blood pressure, heart rate, plasma catecholamine levels, immune responses, enhanced respiratory burst, pupil reactions, slower heart rate, improved pulmonary function, as well as many other objectively measured indications of improved body physiology.

In conclusion, Data reviewed in this article lend strong support to the popular contention that chiropractic adjustments, for the purpose of correcting subluxations, confer health benefits to people regardless of the presence or absence of symptoms.  The JVSR article authors further conclude, A significant amount of preliminary evidence supports that people without symptoms can benefit from chiropractic care.  It is plausible that chiropractic care may benefit every function of the body and have the potential for long-term, overall health benefit to those receiving chiropractic care.