Question: is blue dye bad for you?
Answer: The safety of artificial food dyes is highly controversial. However, the studies that have evaluated the safety of food dyes are long-term animal studies. Interestingly, studies using Blue 1, Red 40, Yellow 5 and Yellow 6 found no evidence of cancer-causing effects ( 13 , 14, 15 , 16 , 17, 18, 19 ).