Spirulina is seawater microalgae that have potential as natural source of iodine and contain of 94.5 ppm iodine. The purpose of this study was to determine the effect of spirulina consumption on TSH and fT4 level at women of childbearing age in IDD (Iodine Deficiency Disorder) endemic area, who at risk of hypothyroidism. This is a Randomized Control Trial (RCT), double-blind research. Subje…