Q&A-1: What percentage of the human body is bacteria?

What percentage of the human body is bacteria?

Jun 13, 2012

3 percent

The human body contains trillions of microorganisms — outnumbering human cells by 10 to 1. Because of their small size, however, microorganisms make up only about 1 to 3 percent of the body's mass (in a 200-pound adult, that's 2 to 6 pounds of bacteria), but play a vital role in human health.

Source: Google.com