There are tons of common foods and food additives that are known to interact with medications. Grapefruit juice for instance has a large and diverse set of drug interactions, some potentially very dangerous: https://www.drugs.com/article/grapefruit-drug-interactions.h... but that doesn't mean it's illegal to sell or consume.
If you're intentionally researching and developing an additive that weakens the effect of a prescription medication and you're not telling people the. You're effectively poisoning them.
There are tons of common foods and food additives that are known to interact with medications. Grapefruit juice for instance has a large and diverse set of drug interactions, some potentially very dangerous: https://www.drugs.com/article/grapefruit-drug-interactions.h... but that doesn't mean it's illegal to sell or consume.