Apple cider vinegar (ACV) has been called a miracle elixir for everything from digestion to weight loss. You've probably seen claims that a daily dose can help burn fat, curb appetite and speed up metabolism-but does it really work?

In Netflix's 'Apple Cider Vinegar,' Milla uses black salve to try and treat her cancer. But what is black salve and does it work? Here's what the FDA says.