This is a very interesting question because it queries our perspective on some new foods in our nutrition.
In South Africa and in Mexico where Spirulina grows naturally in some lakes, the locals are handling Spirulina as a normal food from nature. All the rest of us we have to go to a store and buy Spirulina in a package. Specially for Spirulina Powder, which we can use in everyday cooking like flour, salt or sugar (only much more healthy), we have to rethink it and consider it not as an extra supplement but like a normal food we buy from a grocery shop. The only main difference is that this food is one of the most complete and healthy foods from mother nature.