Lemon yellow is a synthetic pigment that accents colors. It is mostly used as a coloring agent for food, beverages, pharmaceuticals, cosmetics, food packaging materials and so on.
The reason why lemon yellow can be used as a food and drug coloring agent is because it is relatively high safety, basically non-toxic, not stored in the body, the vast majority of the original form of the body, a small amount of metabolism, and its metabolites do not have a toxic effect on people.
However, the dosage must be strictly limited. When the intake is too large, more than the liver load, it will be accumulated in the body, the kidneys and liver have some damage.
Lemon yellow can make food look good, and there are generally no toxic side effects when ingested within safe limits. But try to choose natural food with less coloring and processing to ensure human health.