$products = get_field('product');

if (get_field('product')) {
    foreach ($products as $product) {
        $current_user = wp_get_current_user();

        if ( is_user_logged_in() && (wc_customer_bought_product( $current_user->user_email, $current_user->ID, $product->ID ))) {
            return true;
        } else {
            echo '<div>' . do_shortcode('[add_to_cart id="' . $product->ID . '" style=""]') . '</div>';
        }
    }
}