After looking through recipes for bone broth stock / soup I noticed that it is often claimed that adding apple cider vinegar to the mixture helps extract nutirents / minerals from the bones.
Below is an example of one such claim but there are many others.
Add 2 tablespoons of apple cider vinegar to the cold water to help draw the nutrients from the bones.
Is there any basis to this claim either theoretical or empirical (e.g. tested) or is it just something somebody made up and it just got shared around.