The only thing to debate about the blue dye is if it's considered and inactive or active ingredient. Its approved for use as a pharmacologically inactive substance by the fda.
The following legal limits apply in the EU (E 131) and other countries: 150–300 mg/kg depending on the type of food. Safety limit for foods and drugs: 0.1 mg/day per kg body weight.[8] The ADI for Brilliant Blue FCF is 6 mg/kg. Rexista will way below any of those guidelines.
The FDA Definitions of Direct and Inactive are as follows
1. What is an inactive ingredient?
According to 21 CFR 210.3(b)(8), an inactive ingredient is any component of a drug product other than the active ingredient.
2. What is an active ingredient?
According to 21 CFR 210.3(b)(7), an active ingredient is any component of a drug product intended to furnish pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body of humans or other animals. Active ingredients include those components of the product that may undergo chemical change during the manufacture of the drug product and be present in the drug product in a modified form intended to furnish the specified activity or effect.
Now we know it doesn't furnish pharmacological activity, cure, mitigate anything, treat, diagnose, or affect the structure or function of the body. The ONLY way you can say it can be considered active is if its used to prevent. Which its not really because if its consumed as it's intended then it acts as an inactive ingredient and really does sweet f' all. That's my take.
