Annatto vs Riboflavin: which is worse?

What is Annatto?

Annatto is a natural orange-yellow colorant extracted from the seeds of the achiote tree (Bixa orellana), native to tropical America. The active coloring compounds are bixin (oil-soluble) and norbixin (water-soluble). It has been used for centuries in Latin American cuisine for both coloring and mild flavoring. In processed foods, it provides a yellow to orange color in cheese, butter, and snacks.

What is Riboflavin?

Riboflavin (vitamin B2) is an essential water-soluble vitamin used as a yellow food colorant (E101). It naturally occurs in meat, fish, dairy, eggs, and leafy greens. Commercial riboflavin for food use is produced by bacterial fermentation (primarily using Ashbya gossypii or Bacillus subtilis). It provides a yellow-to-green-yellow color in foods.

Documented risks

Annatto: Generally considered safe. However, annatto has been associated with allergic reactions, including hives (urticaria), in sensitive individuals — more frequently than most other natural food colorants. A 2008 review in the Annals of Allergy, Asthma & Immunology documented cases of annatto-induced reactions. There is also ongoing debate among consumer advocates (including CSPI) about whether annatto is truly risk-free due to these allergic properties, though EFSA and FDA maintain it is safe at approved use levels.

Riboflavin: Riboflavin is one of the safest food additives. It is an essential nutrient with no established upper tolerable intake limit due to its extremely low toxicity — excess riboflavin is simply excreted in urine (which turns bright yellow). No carcinogenicity, teratogenicity, or mutagenicity has been identified.