ADHD

Table of Contents

03 Sep 2023

Attention-deficit/hyperactivity disorder (ADHD) is a brain disorder, often surfacing in children and continuing to manifest its symptoms into adulthood. Some inattention or hyperactivity is normal in young people, but when inattention and hyperactivity are part of an ongoing, destructive pattern that interferes with normal development, it may be due to ADHD. It is possible to treat ADHD, but there is currently no known cure.

OTC supplements

L-Tyrosine

L-Tyrosine is an amino acid that is used to produce noradrenaline and dopamine; supplemental appears to be anti-stress for acute stressors (which tend to deplete noradrenaline) and may preserve stress-induced memory deficits.

increase in dopamine / focus.
10-1200mg.
Be careful / low dosage best.

Source: Andrew Huberman.

DHA

DHA is an omega-3 fatty acid that is a primary structural component of the human brain, cerebral cortex, skin, and retina. It can be synthesized from alpha-linolenic acid or obtained directly from maternal milk or fish oil.

For ADHD, 300mg+/day.

Source: Andrew Huberman.

Maritime Pine Bark Extract

Maritime Pine Bark Extract is a supplement that is derived from the bark of a pine tree that grows exclusively in southwest France. It is used for its antioxidant properties and may improve blood flow and reduce symptoms of ADHD.

Source: https://www.verywellmind.com/otc-adhd-medication-6500982

L-Phenylalanine

L-phenylalanine is an essential amino acid. It's also found in protein in the foods we eat.

Those with ADHD typically have lower body levels of phenylalanine, meaning supplementing with phenylalanine may help relieve symptoms. Doctors often prescribe it along with medications like Ritalin or Adderall.

"Treatment of attention deficit disorder with DL-phenylalanine"
https://pubmed.ncbi.nlm.nih.gov/3903813/

Iron

Iron is a mineral that is essential for the production of hemoglobin, a protein that helps red blood cells deliver oxygen throughout your body. Iron deficiency can cause anemia, which can lead to fatigue, weakness, and difficulty concentrating.

For ADHD: iron is involved in the production of dopamine, a neurotransmitter that is involved in ADHD.

Source: https://www.verywellmind.com/otc-adhd-medication-6500982

Zinc

Source: https://www.verywellmind.com/otc-adhd-medication-6500982

Prescription

Guanfacine

Yes, guanfacine (sold mainly as Intuniv extended-release tablets) can be obtained in Germany, but only with a doctor’s prescription.

It has EU-wide approval since 2015 and is available in German pharmacies as 1–4 mg prolonged-release tablets. It is licensed specifically for ADHD in children and adolescents aged 6–17 when stimulants are unsuitable, not tolerated, or ineffective. It is not a controlled substance.

For adults it is not licensed for ADHD, so any use is off-label. Doctors can still prescribe it (often on a private prescription), but statutory health insurance typically will not cover the cost. Generic versions such as Guanfacin Neuraxpharm also exist.

Modafinil / Modvigil

Modafinil is not FDA-approved for ADHD and the evidence in adults is weak.

Large randomized trials and meta-analyses generally find no reliable benefit over placebo for core ADHD symptoms (inattention, hyperactivity, impulsivity) in adults. A 9-week dose-finding RCT and several network/meta-analyses (including 2018–2019 analyses) showed effect sizes near zero, unlike stimulants (methylphenidate, amphetamines/lisdexamfetamine) and atomoxetine, which do outperform placebo.

It performs better in children and adolescents in shorter trials, but that does not carry over consistently to adults.

It is sometimes tried off-label when first-line stimulants are not tolerated or when excessive sleepiness/fatigue is prominent, because it has a different mechanism and somewhat lower abuse potential. Common side effects include insomnia, headache, decreased appetite, and anxiety. It is not a substitute for established ADHD treatments. A clinician should weigh individual risks (including psychiatric and cardiovascular history).

Modvigil is a generic brand of modafinil (typically 100 mg or 200 mg tablets) made by HAB Pharmaceuticals in India. Research almost always studies the active ingredient, modafinil (or brand-name Provigil), not this specific generic. Bioequivalence is assumed for approved generics, though user reports sometimes note batch-to-batch differences in onset or side effects.

modafinilfacts.com

Modafinil is an atypical wakefulness-promoting agent (eugeroic). It inhibits the dopamine transporter and also affects orexin, histamine, glutamate, and other systems. It is pharmacologically distinct from classic amphetamines and has lower abuse liability, though it is a Schedule IV controlled substance in the US.

Circadian rhythm and chronotherapy

23 Sep 2026

Source: Brandon Luu and Nicholas Fabiano, "ADHD as a circadian rhythm disorder: evidence and implications for chronotherapy", Frontiers in Psychiatry, 2025. Open access: PubMed, full text on PMC.

It's a perspective article, not a new trial: 2 Canadian researchers (Queen's University and the University of Ottawa) pull the existing studies together and propose a way to act on them.

The claim: in a large subgroup of people with ADHD, not all of them, the body clock runs late. The authors don't want ADHD reclassified as a circadian disorder. They want the late clock recognised as a common phenotype, screened for, and treated alongside standard ADHD care.

The evidence

Marker Finding in ADHD
Insomnia and sleep problems Up to 80% of adults and up to 82% of children
Delayed sleep-wake cycle 73% to 78% of children and adults
Melatonin onset (DLMO) About 45 minutes later in children, about 90 minutes later in adults
Cortisol A flatter, later morning rise. Lower morning cortisol in children
Pineal gland Smaller than in controls. The smaller it is, the stronger the evening preference
Clock genes Weaker BMAL1 and PER2 rhythms. Symptom severity tracks the weaker PER2 rhythm
  • The sleep findings hold after controlling for anxiety and depression.
  • Some children with ADHD have high daytime melatonin, which methylphenidate brings down.
  • Cause and effect are still open: a later lifestyle means more evening light, which could explain part of the delay.

DLMO, dim-light melatonin onset, is the time melatonin starts to rise in the evening, measured in saliva under dim light. It's the standard marker of where the body clock sits.

What moved the clock

Intervention Who Result
Melatonin 0.5 mg a night Adults, randomised trial DLMO 88 minutes earlier, ADHD symptoms down 14%
Melatonin 3 to 6 mg a night, 4 weeks 101 unmedicated children with insomnia DLMO 44 minutes earlier (placebo: 13 later), 20 minutes more sleep
Same children, long-term follow-up 65% still took melatonin Stopping delayed sleep again in 92%. Parents saw better behaviour (71%) and mood (61%)
Morning light, 10,000 lux lamp, 2 weeks Adults, pilot trial DLMO 31 minutes earlier, mid-sleep 57 minutes earlier
Morning light plus melatonin Adults with a delayed sleep phase The largest shift: about 2 hours
Morning light, 3 weeks in autumn and winter Adults The shift in chronotype best predicted symptom improvement
Behavioural sleep programme 244 children, randomised trial Better symptoms, sleep, quality of life and functioning after 6 months

2 details matter:

  • In the 4-week children's trial, melatonin improved sleep but didn't change cognition or behaviour within that time.
  • Winter looks like the best season for light therapy. 27% of adults with ADHD in clinical samples have seasonal affective disorder, women most of all.

The behavioural sleep programme was light: 2 sessions 2 weeks apart with a psychologist or paediatrician, then 1 follow-up phone call.

The night-owl protocol

A trial in 22 healthy people with late chronotypes, not people with ADHD, shows how far behaviour alone can move the clock. After 3 weeks:

  • DLMO moved about 2 hours earlier, wake-up time 1.9 hours earlier, and the cortisol peak 2.2 hours earlier.
  • Depression scores fell by about 58% and stress scores by about 40%.
  • Cognitive and physical performance improved.

The rules:

  • Wake up 2 to 3 hours earlier, at the same time every day.
  • Get as much morning light as possible, and cut evening light.
  • No late dinners.
  • No caffeine after 15:00.
  • Exercise in the morning.
  • No naps in the late afternoon.

Exercise at any time of day advanced DLMO in late chronotypes. The authors think the protocol should transfer to ADHD, but it hasn't been tested there.

The proposed pathway

Behaviour first, melatonin only where needed:

  1. Screen every ADHD patient for sleep and circadian problems.
  2. Characterise the clock: a chronotype questionnaire, sleep tracking, and a DLMO test where possible.
  3. Change the routine: a fixed wake time, bright morning light, less light and fewer screens in the evening, and regular timing for meals, exercise and social contact (the zeitgebers, the cues that set the clock).
  4. Add low-dose melatonin only for a confirmed or probable delay in DLMO.

Limits

  • It's a perspective, not a systematic review with pooled numbers. Several of the studies are small pilots.
  • The late clock affects a subgroup. It doesn't explain ADHD as a whole.
  • No study shows ADHD going into remission with circadian treatment. The measured effect on symptoms is modest, like the 14% in the adult melatonin trial.
  • The best melatonin dose and timing relative to DLMO aren't settled.

Takeaways

  • Check the clock first. A late chronotype is common in ADHD and cheap to measure.
  • Light and melatonin work best together. Each moved the clock on its own, and combined they moved it by about 2 hours.
  • Low doses work. 0.5 mg of melatonin moved DLMO by 88 minutes in adults.
  • Routine comes first. The pathway starts with a fixed wake time and regular cues, before any supplement.

Summary drafted by NicAI from the full text of the paper.

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