| Substance | Condition | Seq | Src | PMID | Dtl | Title |
| 5-HTP | Fibromyalgia | 1 | PM | 9802912 | 📋 | Fibromyalgia and the serotonin pathway |
| 5-HTP | Fibromyalgia | 2 | PM | 1521674 | 📋 | Primary fibromyalgia syndrome and 5-hydroxy-L-tryptophan: a 90-day open study |
| 5-HTP | Headache | 1 | PM | 10849040 | 📋 | L-5-Hydroxytryptophan in the prophylaxis of chronic tension-type headache: a double-blind, randomized, placebo-controlled study. For the Portuguese Head Society |
| 5-HTP | Headache | 2 | PM | 6397729 | 📋 | [Treatment of essential headache in developmental age with L-5-HTP (cross over double-blind study versus placebo)] |
| 5-HTP | Migraine | 1 | PM | 3913752 | 📋 | Serotonin precursors in chronic primary headache. A double-blind cross-over study with L-5-hydroxytryptophan vs. placebo |
