Even if you do everything right, that plastic palette you tried to recycle still ends up in a landfill and enters the waste stream of the planet.
A store can have a product on the shelf (or a person can have an unused product in his/her home) that is technically new (unopened) but several years old. Depending upon the type of product and the ingredients, a “new” product could expire in the jar or package without ever being opened.
The thought “How can I be allergic to everything!” comes to mind when you try one product, react, try another, react, and so forth. But since sodium lauryl sulfate is in such a wide variety of products, and in varying amounts, narrowing down the culprit that causes your issues can be frustrating.