I tried the below but it is not working.
$args = array(
'posts_per_page' => -1,
'post_type' => 'product',
'taxonomy' => 'product_cat',
//Tries to show products from categories where current user ID is in the category_user field
'meta_query' => array(
array(
'key' => 'category_user',
'value' => '"' . $current_user->ID . '"',
'compare' => 'LIKE'
)
)
);