This is the lot where I found the rats with the low serotonin levels.

"That helps explain why the serotonin levels grew over time."

And you can influence serotonin levels by eating certain foods.

If low serotonin levels aren't responsible for depression, what is?

A stable serotonin level in the brain is associated with a positive mood state or feeling good over a period of time.

This is a vehicle designed to instantly lower your serotonin level by 50 percent.

Then we run that data against their serotonin levels.

Maybe my serotonin level was low, but his book left me feeling much less hopeful.

These have physiological effects on the body and are linked to serotonin levels in the brain.

It has been linked to serotonin levels in the brain.