| does serotonin affect depression | 1.27 | 0.3 | 5462 | 32 | 26 |
| serotonin effect on depression | 0.06 | 0.2 | 1887 | 30 | 39 |
| serotonin and depression connection | 1.91 | 0.6 | 3609 | 35 | 87 |
| serotonin not linked to depression | 0.93 | 0.3 | 4066 | 34 | 81 |
| relationship between serotonin and depression | 1.55 | 0.1 | 4536 | 45 | 58 |
| does serotonin help with depression | 0.36 | 0.4 | 9674 | 35 | 12 |
| does low serotonin cause depression | 1.18 | 0.1 | 5738 | 35 | 19 |
| does lack of serotonin cause depression | 0.03 | 0.8 | 9268 | 39 | 39 |
| serotonin function in depression | 0.11 | 0.6 | 6259 | 32 | 85 |
| is serotonin decreased in depression | 0.33 | 0.4 | 5454 | 36 | 95 |
| serotonin role in depression | 1.39 | 0.5 | 2164 | 28 | 6 |
| serotonin in the brain and depression | 1.43 | 0.1 | 9361 | 37 | 95 |
| serotonin levels and depression | 0.16 | 1 | 9162 | 31 | 66 |
| do high levels of serotonin cause depression | 1.48 | 0.4 | 3713 | 44 | 78 |
| serotonin and depression not linked | 1.59 | 0.8 | 6211 | 35 | 38 |
