 Spirulina is a type of blue-green algae that contains high levels of protein and carotenoids. In this study, researchers examined the effectiveness of spirulina in increasing the body's total body vitamin A stores in Chinese school-aged children who are at risk for vitamin A deficiency. They found that children who took 2 grams or 4 grams of spirulina per day had higher levels of carotene in their blood than those who did not take any spirulina. This suggests that spirulina could be a beneficial food source for these children as it increases their vitamin A stores. This article was authored by Lei Li, Xi'an Fengjiao, Jia Wang, and others.