Is Spirulina really good for our health ?

[jyaron]

Or maybe something like Vitamin C. It is an antioxidant, but if you get too much it has just the opposite effect.

This is actually not correct. Of the "simple" vitamins, only A, D, E, and K can pose a problem when you have too much. The reason for this is that they are fat-soluble and will be retained in your body for longer periods of time. If you consume too much then the amounts of these vitamins can reach toxic levels.

Other vitamins, such as vitamin C are water soluble and will simply be expelled from the body as waste; you cannot overdose on vitamin C (though it is often acidic and may cause some sort of urinary tract infection... but not because it is a vitamin.)

[jasfr]

My question is, once spirulina is processed into powder, flakes, or tablets, does it still retain its health benefits? Is there a certain form and brand that is better?
Thanks.