Each company is different, but it's probably not what you think
If there are lots of options it can be hard to know which one is right for you. Companies create quizzes then recommend the appropriate mass produced product to you- it's a personalized recommendation.
Going through a quiz then being told that your product is "personalized" DOES NOT mean that is was custom formulated or custom made. Look for phrases like "custom made", "one-of-a-kind", and "unique" if you want to know if your product is actually custom made for you and not just selected for you.
Most "personalized nutrition" companies put the customer's name on the packaging. People assume that if the package is personalized then the contents of the package are personalized too. Not so. Many companies put custom labels on non custom products to make it seem like the products are custom.
We use your quiz responses to custom formulate then custom manufacture one-of-a-kind personalized products. Nothing is pre made.
The other personalized nutrition companies that you think are custom making unique products just for you probably aren't. Ask them.
Wonder what's in your unique personalized blend?