If you have not added your own meta description on every product on setup
You will find Vm does not create a meta description element in the head
Bad for SEO and a bugger to have to add manually for every product
On the BIG assumption that your product description, category name and product short description have been considered for SEO
Then I recommend a base change to populate the meta tag description with some sensible data that is created on every product if the Prodcut data has not had a meta description created in admin.
components\com_virtuemart\views\productdetails\view.html.php
if ($product->metadesc) {
$document->setDescription($product->metadesc);
}
with
if ($product->metadesc) {
$document->setDescription($product->metadesc);
} else {
$document->setDescription( $product->product_name . " ". $category->category_name . " ".$product->product_s_desc );
}
//quorvia end