Adding a Custom Field for Products (snippet 5)

add_action('woocommerce_product_meta_start', 'wcv_ingredients', 2);

function wcv_ingredients() {

    $output = get_post_meta( get_the_ID(), 'wcv_custom_product_ingredients', true ); // Change wcv_custom_product_ingredients to your meta key

    echo 'Ingredients: ' . $output . '';

}