Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Spirulina...

I had to return the product after one try. The fact is that you can get everything in this supplement from a very good diet. Do not believe when people tell you that it tastes great. This product smells like rotten eggs and the taste is horrible as well. The B12 in Spirulina is very questionable according to some studies. There are different producers of Spirulina and the best are produced in an organic form in India and non organic in Hawaii. Spirulina powder is in a natural form, it is not a byproduct of another product and research shows that powder is more effective than tablets since it is the raw product. Buy the tablets otherwise I can assure you, unless you are not dedicated or do not have an excellent reason, no way in the world you will tolerate the smell of it at all less alone the rotten taste of it. To get the same affects as one table spoon of powder you will need to take probably over 10 tablets.