Trial reportPloS one2026
The effect of 5-hydroxytryptophan, a serotonin precursor, on adults with high levels of Attention Deficit Hyperactivity Disorder traits: A randomised, controlled trial.
Trial report in PloS one, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07777328 (The Effect of 5-hydroxytryptophan on Microsaccades and Distractibility in Individual With High Levels of ADHD Traits), which is not on this map. Not yet cited in PubMed.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
The Effect of 5-hydroxytryptophan on Microsaccades and Distractibility in Individual With High Levels of ADHD Traits: a Randomised, Double-blind Trial
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundAlthough several effective therapies exist for Attention Deficit Hyperactivity Disorder (ADHD), current pharmaceutical treatment carries a high risk of misuse and high levels of discontinuation, evidencing a need for alternatives. One possible avenue is serotonergic intervention, particularly within the serotonin synthesis pathway, where there are several potential loci of dysfunction in ADHD. This study aimed to assess the efficacy of acute 5-hydroxytryptophan, a serotonin precursor, in reducing distractibility in adults with high levels of ADHD traits. TRIAL DESIGN AND
methodsThe study consisted of a randomised, controlled trial to assess the effects of acute 5-hydroxytryptophan administration compared to placebo. Participants consisted of individuals with high (N = 56) and low (N = 56) levels of ADHD traits, determined using the Adult ADHD self-report scale screener (ASRS v1.1), with randomised allocation to intervention or placebo in a 1:1 ratio. Both participants and investigators delivering the trial were blind to the allocation. Baseline testing of distractibility using a task-relevant (Eriksen flanker) and novel task-irrelevant (N-back coupled with an auditory stimulus) paradigm was completed, participants were given the intervention or placebo, and tasks were repeated 90 min post-administration. RESULTS AND
conclusionsThe flanker and N-back task found few differences between individuals with high and low levels of ADHD traits, and the N-back task did not produce a distractor effect as initially predicted. 5-hydroxytryptophan produced no significant positive effect in any measure of distractibility that differed between individuals with high or low ADHD traits. Only accuracy on silent trials in the N-back task was affected by 5-hydroxytryptophan administration: placebo participants showed an improvement in performance and 5-hydroxytryptophan-administered participants did not. 19.6% of participants in the 5-hydroxytryptophan group experienced adverse events of fatigue, nausea or vomiting. Although 5-hydroxytryptophan did not elicit a positive effect on ADHD traits,further work should be conducted with measures more sensitive to ADHD traits to fully understand the impact of 5-hydroxytryptophan supplementation on the condition.
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