Yellow Food Coloring – In countries where turmeric is very popular, such as India, some manufacturers use the food colorant metanil yellow (acid yellow 36) to enhance the color of Turmeric. If consumed in high amounts, metanil yellow has been shown in animal studies to cause a wide range of health problems. While metanil yellow is banned in the US, it is vital to avoid any turmeric with food coloring.15
Lead – Turmeric is often grown throughout South Asia and Bangladesh, India is considered a major source for this beneficial spice. Since Turmeric is a plant grown in soil, there are some naturally occurring lead compounds found in soil that the plant will absorb as it grows. However, a recent Stanford-led study indicated that some turmeric originating from Bangladesh was contaminated with a man-made lead-based chemical compound.16
Additional studies have revealed that turmeric was the cause of high levels of lead in the blood of children in Bangladesh.17, 18 Lead is a neurotoxin that in high levels can damage the heart, brain, and kidneys.19 Look for a turmeric curcumin supplement that has been third-party lab tested to ensure it is contaminant-free.