What're the health benefits of spirulina, and are there different types?

Spirulina: Spirulina, or blue-green algae, has not been shiwn to be effective for a wide range of ailments, and if contaminated, could be harmful. See http://www.Nlm.Nih.Gov/ medlineplus/druginfo/natural/923.Html for details.

Spirulina: Spirulina contains 60-70% protein, b complex vitamins, phycocyanin, chlorophyll, beta-carotene, vitamin e, and numerous minerals. It contains more beta-carotene than carrots! 2 types of algae are chlorella and blue green (which spirulina is). These are very rich food sources, but some can be contaminated with heavy metals like lead & mercury. Do your diligence in researching brands!