Gut dysbiosis at age 1 precedes ADHD diagnosis by years — the first prospective evidence for a causal microbiome→ADHD pathway (Ahrens et al., 2024, n=16,440). Adults with ADHD show reduced SCFA-producing bacteria and elevated inflammatory species. Stimulant medications may further reduce microbial diversity. Probiotics show modest benefit in RCTs (SMD ~0.24), optimal duration 8 weeks. A healthy Mediterranean-style diet outperformed elimination diets in the largest trial (51% vs 35% improvement). Prioritize diet over supplements; probiotics are adjunctive.
20 sources 3/4 moderate Updated 2026-04-15
73–78% of adults with ADHD have delayed sleep-wake cycles with melatonin onset ~90 minutes later than controls. This isn't just comorbidity — emerging evidence frames ADHD as partly a circadian rhythm disorder. The Delphi consensus protocol: 0.5mg immediate-release melatonin taken 3 hours before habitual sleep onset, advancing by 1 hour weekly for 3–4 weeks. Counterintuitively, stimulant medications may improve (not worsen) sleep quality by reducing pre-sleep rumination.
22 sources 4/4 strong Updated 2026-04-15
Adults with ADHD show consistent deficits in iron (ferritin <30 ng/mL in 84%), vitamin D (6.5 ng/mL lower), zinc, and magnesium. Supplementing these deficiencies produces measurable symptom improvements — particularly ferritin optimization (target >50 ng/mL), vitamin D (4000 IU/day), and zinc (15–30mg). L-tyrosine shows no benefit and develops tolerance. Screen for deficiencies before supplementing; prioritize iron and vitamin D testing.
28 sources 3/4 moderate Updated 2026-04-15
80.5% of women with ADHD report symptoms affected by hormonal changes; 68.2% worsen premenstrually, 55.9% during perimenopause. Women are diagnosed 3.5 years later on average, and 70% receive antidepressants before any ADHD diagnosis. The estrogen-dopamine axis explains cyclical symptom fluctuations: high estrogen (follicular phase) improves dopamine signaling, low estrogen (late luteal, postpartum, menopause) worsens ADHD. Evidence for cyclical medication adjustment is preliminary but 70% of women who self-adjusted reported benefit.
24 sources 3/4 moderate Updated 2026-04-15