The Human Holobiont: Your Body Is an Ecosystem
You are 50%% bacteria. 90%% of your serotonin is made in your gut. 12 peer-reviewed sources reveal how your inner ecosystem controls mood, immunity, and weight.

You are 50%% bacteria. 90%% of your serotonin is made in your gut. 12 peer-reviewed sources reveal how your inner ecosystem controls mood, immunity, and weight.