I think it's important to be careful. Large-scale double-blind studies have not shown a consistent benefit to chiropractic care. I think this is in part because the profession is not overall as regulated either in terms of entry or in terms of standards of care as conventional medical practice. A large-scale study looking into the benefits of chiropractic care will probably tend to include all kinds of chiro, from practitioners who have gone through a rigorous formal training program and the equivalent of a medical residency to those who picked it up here and there and hung out a shingle.
If you are contemplating chiro, I suggest getting a recommendation from a qualified and trusted medical professional, ideally a sports orthopedist (not Aunt Sue, whose back problems have really improved since she started getting weekly adjustments four years ago and buying hundreds of dollars of supplements). My daughter has been seeing her guy for almost three years now. The go-to sports orthopedist for our team recommended him after we finally took her to see the sports orthopedist following months of frustration from a misdiagnosed back injury. Some of the hallmarks that tell me he's the right guy are the following:
-- He has a real, rigorous degree
-- He does adjust her, but he also assigns PT exercises and spends a lot of time showing her how to do them
-- He explains the biomechanics of the adjustments he does, and the basis on which he is assigning exercises
-- He started seeing her once a week, but rapidly cut her back to every other week, and then released her to come back on an as-needed basis
-- She saw immediate improvement, and has been maintaining through the occasional adjustments
-- When he thinks she needs to see an orthopedist for imaging, he sends her rather than continuing to treat her himself
Because we've appreciated his approach, he has also picked up my hubby and my FIL as patients. Hubby is now on a see-as-needed basis, but for my FIL, he says he's done all he can at this point for those 88-year-old hips and just encourages him to keep up with the PT exercises at home. My FIL is still struggling, but definitely has more mobility than he did.