This claim is accurate! The article begins by referencing Harvard, which states that dark chocolate is rich in flavanols that help protect the heart from cardiovascular diseases. It goes on to make additional claims about dark chocolate, such as its ability to prevent cancer, improve cognitive function, and protect against free radicals. Harvard is the sole source backing these claims, so I found another article on the topic. I came across a piece from the Cleveland Clinic that provides even more details about the health benefits of dark chocolate. Three doctors have confirmed that Cleveland Clinic is a reliable source, so I would affirm that the claim is true, dark chocolate does offer health benefits.