This plugin will enable to add Google reCAPTCHA in your woocommerce single product page.

Use CAPTCHA to stop spam and allow customers & users to interact with your website easily. Block fake accounts and orders. Avoid false positives.

reCAPTCHA in WP comments form is an ANTISPAM tool that adds a Google reCAPTCHA to the comments form and protects your site from the spam robots threats.