How long can blue food dye stay in your system?
•
4 min read
A study known as the 'Blue Poop Challenge' revealed that the median time for food dyed with blue coloring to pass through the system is 28.7 hours. This shows that blue food dye can stay in your system for approximately one to two days for most healthy individuals, but the rate of excretion is highly variable and depends on a number of personal and dietary factors.