A. Some people feel a difference in as little as a week. Most people feel a difference within a month. Unlike pharmaceuticals that can start working within a day or two, astaxanthin bioaccumulates in the body. Regular supplementation will build up adequate levels in the body over a couple of weeks.
We have had some people who have taken it for long periods and not felt any different but then were told by their doctor that their condition seemed to have improved based on blood tests. It is hard to predict how it will affect any individual. And some people don't notice anything until they stop taking it and realize that symptoms they had forgotten about suddenly return.