Spirulina vs Chlorella: What is the difference?

Hi,

I have been reading a lot of material but I still don't really understand the difference between these 2 supplements, significant for their protein and B12 content.

Is one better than the other? and why?
Do both contain iodine?


//www.curezone.org/foods/algaepage.asp


I would appreciate your help in understanding which to buy.
MiamiNice

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