05 Feb 2019 --- Folate levels decrease during the months when solar radiation is higher and ultraviolet radiation proportionately affects folate levels in the blood. This is according to University of Malaga researchers, who have determined a seasonal risk threshold for people with folate deficiency in the blood. The team has developed a mobile app to determine sensitivity to sunlight depending on folate levels and suggests folate supplementation during the summer months to keep its levels balanced.