Spirulina Powder 1 lb from Source NaturalsSpirulina Powder Spirulina are blue green microalgae with high nutritional value. They are especially rich in protein, beta carotene, and chlorophyll, and provide one of the few natural food sources of vegetarian vitamin B 12. Supplement Facts Serving Size: 1 tablespoon Amount %DV Hawaiian Spirulina 9,000 mg Yielding approximately: Protein 5. 4 g 0. 11 Vitamin A (as beta carotene) 42000 IU 8. 4 Thiamin (vitamin B 1) 300 mcg 0. 2 Riboflavin (vitamin B