As of 2015, there is insufficient evidence that spirulina alleviates diabetes symptoms, according to WebMD. However, a preliminary study showed that individuals who took one gram of spirulina a day by mouth for two months had lower blood sugar.
Spirulina, or blue-green algae, is a supplement derived from simple, plant-like organisms, explains WebMD. Many people claim that the supplement has various positive effects on the human body, such as helping treat hayfever, ADHD, stress, diabetes and depression. However, studies have found that, of all the purported claims, the only one in which spirulina may be effective in treating is precancerous mouth sores. Study is still ongoing, but research suggests that spirulina may have a positive effect on one's immune system, helping to reduce swelling and inflammation.