 you start talking about it, it can come from multiple areas. And I always say it can come from an anemia, which is a lack of iron, a lack of B12 getting into the bloodstream, which creates more oxygen. It could be a lack of folic acid, which absorbs that. It could also be the thyroid, which can be a big challenge too. The thyroid gland can play a big role as far as that goes. And also, one of the big challenges that we see with something like this is