Spirulina is a wonderful superfood. It contains many nutrients which make it a great multi-mineral/vitamin. Best taken every single day - which is perfectly safe, as it is a food, not a chemical supplement. Overview. With 46 Fruits, Vegetables, Spirulina, Wheatgrass, Barley
If you want to take the best spirulina make sure you get one which is organic. Organic is important if you want the best. If it is harvested from the wild there is a chance that they may be environmental contamination, so the recommended source is to get organic spirulina which has been 'farmed' in tanks, and then harvested perfectly safely.
By all means do take spirulina daily. Another advantage of spirulina is that in one study it was fount to reduce 'bad' cholesterol. Although this is only one study, the other benefits of spirulina make it worth taking anyway.