if (!$this->canShow($product)) {
    return false;
}

<?php
class Namespace_Modulename_Helper_Product extends Mage_Catalog_Helper_Product
{
    //use to check product view visibility status
    const VISIBILITY_IN_PRODUCT_VIEW_PAGE = 1;

    public function canShow($product, $where = 'catalog')
    {
        if (is_int($product)) {
            $product = Mage::getModel('catalog/product')->load($product);
        }

        /* @var $product Mage_Catalog_Model_Product */

        if (!$product->getId()) {
            return false;
        }
        if ($product->isVisibleInCatalog()) {
            if ($product->getVisibilityInProductView() == self::VISIBILITY_IN_PRODUCT_VIEW_PAGE) {
                return true;
            }
        }
        else {
            return false;
        }
    }
}

if ($product->isVisibleInCatalog()) {
            if ($product->getVisibilityInProductView() == self::VISIBILITY_IN_PRODUCT_VIEW_PAGE) {
                return true;
            }
        }
        else {
            return false;
        }