The statement that is not a medical innovation in the 1800s that improved the standard of living during the Industrial Revolution is:
Bloodletting allowed doctors to equalize the humors of the body.
While bloodletting was practiced for many centuries prior, it is not considered a medical innovation of the 1800s and did not contribute to improved standards of living; in fact, it often harmed patients rather than helping them. The other options mentioned are valid medical advancements that contributed to public health improvements during the Industrial Revolution.