WooCommerce - Change product titles in all caps to title case

<?php
  // change product titles in all caps to title case
  add_filter( 'the_title', 'custom_title_format' );
  function custom_title_format( $title ) {
    if( is_shop() || is_product_category() || is_product() ) {
      $words = explode(  " ", $title );
      $title = "";
      foreach( $words as $word ) {
        $word = ucfirst( strtolower( $word ) );
        $title = $title.$word." ";
      }
        return trim( $title );
    }
      // return the normal Title if conditions aren't met
      return $title;
  }