You've never heard of Goji berries? Probably the most well known, quote-unquote superfood.
In any case, I think I have had them once. It was a sample in some occasion, can't remember anymore.
Did I notice any drastic difference or benefit? Obviously not.
These are something you should consuming on a regular basis to see any kind of noticeable health benefit. It's kinda same like a basic multivitamin supplement. You don't just pop one pill and be covered the rest of the year.
No, you use it on a day to day basis and over time you start seeing those benefits in your health markers (hopefully).