 This restriction on how we specify the content of the right to health means, for example, that we cannot directly infer from (a) the moral fact that Jack has a right to health care and (b) the empirical fact that an experimental pancreas transplant offers him his only chance at survival that (c) Jack is entitled to that intervention. Jack’s medical entitlements—given his right—depend both on his condition and on the array of interventions it is reasonable to provide the population of which he is a member. That reasonable array in turn depends on what we know is effective, what resources we have, and what priority should be given to meeting his need compared to that of others. If pancreas transplants are of unproven efficacy, or if their cost or cost-effectiveness makes including them in a benefit package unreasonable, given what else it would be better to include, then coverage for such transplants may be denied for Jack and others. Although a moral right to health is grounded in the general idea that we have obligations to protect opportunity by promoting normal functioning, its specific content is in this fundamental way system-relative.