You should always use Heading 3 (H3) or lower in your product descriptions to allow your Product title to sit higher in the SEO hierarchy.
If you must use H2, the following may help in some themes:
- Go to Theme Options and scroll down to the Custom Styling section
- Copy and paste the following code into the Custom CSS box:
WP-SYNHIGHLIGHT PLUGIN: NOTHING TO HIGHLIGHT! PLEASE READ README.TXT IN PLUGIN FOLDER!
.woocommerce-tabs #tab-description h2, .woocommerce-tabs #tab-additional_information h2, .woocommerce-tabs #tab-reviews h2{display: block !important;}
- Click Save Changes