Follow the below codes to get addtional attributes product Magento

$tmpProd = Mage::getModel('catalog/product')->load($product->getId());
			
			$attributes = $tmpProd->getAttributes();
			$addtionalAttributes = array();
			foreach ($attributes as $attribute) {
			    if ($attribute->getIsVisibleOnFront()) {
			    	$addtionalAttributes["{$attribute->getStoreLabel()}"] = $attribute->getFrontend()->getValue($tmpProd);
			    }
			}