I looked up the Good Natured Chorella/Spirulina product I've been using and the Spirulina algae is grown in Taiwan in sunlight in the world's only uncontaminated mountain spring water source. I can't prove if this is marketing, its' simply what is represented. It is one of the highest rated products on product review sites. I like these because they are easily swallowed, very almost too tiny as the dose is 10 tablets, $27 for 1250 tabs on Amazon. I previously tried another brand and these were as big as a horsepill and hard to swallow.