I am unable to fetch json data from wp_db

$user1 = $wpdb->get_results("SELECT * FROM diary_user_form_storage");
foreach ($user1 as $key => $value) {
  $productString = stripslashes($value->product);
   $product=json_decode($productString,true);
  $error_p = implode(' ', $product[0]);
echo  $error_p;


}

Out will be PRODUCT 2 PRODUCT 5