| Clue | Source | Date |
|---|---|---|
| Incomplete — I plan to raise this hormone | ||
| Feast keeps old woman in compound | ||
| 'Feel-good' brain chemical | Eugene Sheffer | 23 Feb 2019 |
| Male in agony embraced by female supplying drug | ||
| Neurotransmitter | The Times Concise | 24 Sep 2015 |
| Pleasure-associated neurotransmitter | ||
| 'Feel-good brain chemical' | ||
| Essential neurotransmitter | ||
| Neurotransmitter of note |