Apparently, few are paying attention to the data on chlorella. Despite articles on chlorella's nutrient and detoxification capacities, health conscious folks are not rushing the shelves of physical or online stores to make sure they get their daily doses of chlorella.
We are bombarded by toxins in the air, water, food, and from within by mercury amalgam fillings! And our major pollutant filter, the liver, needs all the support it can get. Chlorella offers that support abundantly.
Perhaps some independent lab studies will contribute scientific evidence to support the anecdotal material you may have encountered.