diff --git a/includes/fbproduct.php b/includes/fbproduct.php
index 9724541f..6121bc12 100644
--- a/includes/fbproduct.php
+++ b/includes/fbproduct.php
@@ -11,6 +11,7 @@
 
 require_once __DIR__ . '/fbutils.php';
 
+use WooCommerce\Facebook\Framework\Plugin\Compatibility;
 use WooCommerce\Facebook\Framework\Helper;
 use WooCommerce\Facebook\Products;
 
@@ -735,6 +736,11 @@ public function prepare_product( $retailer_id = null, $type_to_prepare_for = sel
 			}
 		}
 
+		// Add GTIN (Global Trade Item Number)
+		if ( Compatibility::is_wc_version_gte( '9.1.0' ) && $gtin = $this->woo_product->get_global_unique_id() ) {
+			$product_data['gtin'] = $gtin;
+		}
+
 		// Only use checkout URLs if they exist.
 		$checkout_url = $this->build_checkout_url( $product_url );
 		if ( $checkout_url ) {
diff --git a/tests/Unit/fbproductTest.php b/tests/Unit/fbproductTest.php
index c8fbbdb0..8b5e7636 100644
--- a/tests/Unit/fbproductTest.php
+++ b/tests/Unit/fbproductTest.php
@@ -304,4 +304,60 @@ public function test_quantity_to_sell_on_facebook_when_manage_stock_is_off_for_v
 
 		$this->assertEquals( $data['quantity_to_sell_on_facebook'], 128 );
 	}
+
+	/**
+	 * Test GTIN is added for simple product 
+	 * @return void
+	 */
+	public function test_gtin_for_simple_product_set() {
+		$woo_product = WC_Helper_Product::create_simple_product();
+		$woo_product->set_global_unique_id(9504000059446);
+		
+		$fb_product = new \WC_Facebook_Product( $woo_product );
+		$data = $fb_product->prepare_product();
+
+		$this->assertEquals( $data['gtin'], 9504000059446 );
+	}
+
+	/**
+	 * Test GTIN is not added for simple product
+	 * @return void
+	 */
+	public function test_gtin_for_simple_product_unset() {
+		$woo_product = WC_Helper_Product::create_simple_product();
+		$fb_product = new \WC_Facebook_Product( $woo_product );
+		$data = $fb_product->prepare_product();
+		$this->assertEquals(isset($data['gtin']), false);
+	}
+
+	/**
+	 * Test GTIN is added for variable product
+	 * @return void
+	 */
+	public function test_gtin_for_variable_product_set() {
+		$woo_product = WC_Helper_Product::create_variation_product();
+		$woo_variation = wc_get_product($woo_product->get_children()[0]);
+		$woo_variation->set_global_unique_id(9504000059446);
+
+		$fb_parent_product = new \WC_Facebook_Product($woo_product);
+		$fb_product = new \WC_Facebook_Product( $woo_variation, $fb_parent_product );
+		$data = $fb_product->prepare_product();
+
+		$this->assertEquals( $data['gtin'], 9504000059446 );
+	}
+
+	/**
+	 * Test GTIN is not added for variable product
+	 * @return void
+	 */
+	public function test_gtin_for_variable_product_unset() {
+		$woo_product = WC_Helper_Product::create_variation_product();
+		$woo_variation = wc_get_product($woo_product->get_children()[0]);
+
+		$fb_parent_product = new \WC_Facebook_Product($woo_product);
+		$fb_product = new \WC_Facebook_Product( $woo_variation, $fb_parent_product );
+		$data = $fb_product->prepare_product();
+
+		$this->assertEquals(isset($data['gtin']), false);
+	}
 }