Yes, I always leave the bones when making the chicken soup . And it has a lot of nutrients, but I meant placebo because it doesn't help fight off an infection like a vaccine or an antibiotic would, and it also doesn't help with fever or inflammation in a noticeable manner. It helps with hydration and some electrolytes I guess, but I suspect an over the counter solution is probably even more effective than the soup.
Benefits are if you regularly include it in your diet. It takes time for your body to pack up its nutrient reserves and make something useful with it. Myth has turned chicken soup into something similar to Popeye's Spinach or Mario's Mushrooms and that's not true.