Blue-Green Algae Powder 4 oz from Source NaturalsSource Naturals Blue Green Algae Powder Dietary Supplement. From Klamath Lake. Source Naturals Blue Green Algae is wildcrafted and harvested in the prime upper regions of Upper Klamath Lake, Oregon, and is of the highest quality available. Its name comes from the two color pigments it contains, phycocyanin, which is blue, and chlorophyll, which is green. Supplement Facts Serving Size: 1 4 Teaspoon (approx 0. 5 gram) Amount %DV Organic Blue Green Algae