>>4151426What can be shown:
- Commercial mayonnaise has a legally required ingredient list. In the US, the FDA defines "mayonnaise" by standard of identity (21 CFR 169.140) - it must contain vegetable oil, egg yolk, and an acid like vinegar or lemon juice, and nothing else beyond specified optional ingredients.
- You can make it yourself from those ingredients and see the result.
- The supply chain, factories, and ingredients are all inspectable and documented.
What can't be done:
- You cannot logically prove a negative to someone who rejects all evidence in advance. If every document, label, factory tour, and lab test is dismissed as "propaganda," then no amount of proof counts. That's the structure of a conspiracy theory - it's built so that disproof is impossible by design, because contradicting evidence is absorbed as further proof of the cover-up.
So the honest answer is: the claim is false, and it's trivially false on the facts.