Organic Chlorella with Rich Source of Vitamin B12 Our Organic Chlorella because of its natural cultivation process yields a high level of Bioavailable Vitamin B12 consistently. The Vitamin B12 levels are 400 mcg/100 gms with the recommended RDA of 2.5 mcg/day and with an average absorption rate, 1 g of our Chlorella is enough for meeting the daily requirement of Vitamin B12 as per RDA.