http://healthyeating.sfgate.com/dangers-spirulina-7035.htmlGout and Kidney Stones
Spirulina contains an abundance of nucleic acids, according to the Beth Israel Deaconess Medical Center. These substances, which are related to DNA, produce uric acid when they are metabolized. If too much uric acid accumulates in your body, gout or kidney stones can develop. If you are susceptible to gout attacks or kidney stones, spirulina may be especially harmful to you. To avoid excessive uric acid, the hospital recommends limiting your intake of spirulina to less than 50 grams per day.