How to be with overloading of memory?

Hi, I’m trying to get a lot of products from my WC shop using $products = wc_get_products()
So, if there are a lot of products, >1000 at least, then memory just grows by leaps and bounds… And when I’m doing unset($products) the memory is not released.
Example:

<?php 
////magic....
memory_get_usage(); //3mb
wc_get_products(); //I even don't keep it anywhere
memory_get_usage() //20mb
////another magic....
?>

What to do with that? thanks.