Over the last two decades no single concept has more aggressively captured the scholarly imagination in diverse academic disciplines than social capital. Social scientists from various fields have posited its existence, deployed it in empirical studies, and have begun to suggest policy applications. As a result, social capital is now everywhere, but nobody knows how it actually works. And this problem is even more prevalent in health than in any other field. In this setting, this brief article sets out to investigate what is known so far about the associations between social capital and health, and offers suggestions as to how produce more health.