@ohdarlingitsbiology
AuDHD · Autism · ADHD · Brain Health · Cluster 3

AuDHD & Brain Health
Supplement Stack

Evidence-based picks for Autism, ADHD and AuDHD co-occurrence. Brain optimisation, burnout resilience and long-term dementia prevention. Start at half dose if sensitive.

~£65–85
Full stack / month
10
Supplements · 4 phases
May 2026
Last updated
10/10
Links confirmed ✅
Affiliate disclosure: This page contains Amazon Associates affiliate links. @ohdarlingitsbiology earns from qualifying purchases at no extra cost to you.
Phase 1 · Foundation
Start at half dose if sensitive
Weeks 1–4
1
Magnesium Glycinate 3-in-1
ADHDAutismSleepSensory
Nutrition Geeks Magnesium Glycinate 3-in-1 · 1800mg · 384mg elemental · 90 vegan caps · UK Made
Cofactor for GABA synthesis — directly addresses the GABA/glutamate imbalance in AuDHD. RCTs confirm Magnesium + B6 combination outperforms magnesium alone for ADHD symptom reduction. Evening dose supports sleep onset — particularly valuable given the delayed melatonin rhythm in AuDHD.
2 caps/day · Evening~£10 · 3 months~11p/day
Amazon
2
Vitamin D3 + K2 MK-7
AutismADHDMitochondrial
Unicorn Brands D3 4000iu + K2 MK7 · 365 tablets · 1-year supply · 14,000+ reviews · UK Made
Near-universal deficiency in ASD and ADHD cohorts. D3 supports serotonin synthesis genes and is a critical cofactor for mitochondrial biogenesis — the energy system that AuDHD masking and processing depletes. Best value D3/K2 on Amazon.
1 tablet/day · With fat~£12 · 12 months~3p/day
Amazon
Phase 2 · Brain & Gut
Allow 8 weeks to assess effects
Weeks 4–8
3
Omega-3 High EPA
ADHDAutismGut-BrainNeuro
Nutravita Omega-3 2000mg · 660mg EPA + 440mg DHA · 240 softgels · 4-month supply · 27,000+ reviews
The most researched supplement for ADHD — meta-analyses confirm high-dose EPA improves attention when baseline levels are low. The 2:1 EPA:DHA ratio is specifically the evidence-based target for neurodevelopmental conditions.
2 caps/day · With meal~£14 · 4 months~12p/day
Amazon
4
Multi-Strain Probiotic
Gut-BrainADHDAutism
Optibac Probiotics Every Day · 30 capsules · Multi-strain · L. acidophilus + Bifidobacterium · UK clinical standard
Gut dysbiosis is confirmed in ASD with a distinct bacterial signature. Meta-analysis shows 8-week probiotic interventions most effective. Targets gut barrier repair, SCFA production and the neuroinflammation driving brain fog and sensory amplification.
1 cap/day · Morning fasted~£15/month~50p/day
Amazon
Phase 3 · Oxidative Stress & Sleep
GABA balance & glutathione
Weeks 8–12
5
NAC 600mg
AutismOxidativeADHD
Solgar NAC N-Acetyl-L-Cysteine 600mg · 60 vegan vegicaps · Soy-free · Benchmark quality
Dual mechanism uniquely valuable for AuDHD. As glutathione precursor it directly addresses confirmed oxidative stress in ASD. As glutamate modulator it reduces the GABA/glutamate imbalance — confirmed to reduce irritability in ASD RCTs.
1–2 caps/day · With food~£22 · 1–2 months~37p/day
Amazon
6
L-Theanine 400mg + B6
ADHDAutismSleepSensory
New Leaf Products L-Theanine 400mg + Vitamin B6 · 120 vegan caps · 2-month supply · B-Corp certified · Amazon's Choice · 900+ bought monthly
RCTs confirm L-theanine improves sleep quality and sustained attention in ADHD. Increases alpha brain waves and GABA activity — directly addressing GABA/glutamate imbalance without sedation. Particularly valuable for the hyperarousal state common in AuDHD evenings.
1 cap/day · Evening~£14 · 2–4 months~12p/day
Amazon
Phase 4 · Long-term Brain Health
Dementia prevention & burnout resilience
Week 12+
7
Creatine Monohydrate (Creapure®)
Brain EnergyDementia Prev.Cognitive Load
Creapure® Certified Creatine Monohydrate · 500g · Unflavoured · Third-party purity tested · GMP
2025 pilot RCT showed creatine increased brain total creatine by 11% and improved global cognition. Replenishes phosphocreatine reserves for rapid ATP regeneration during peak brain demand — critical for AuDHD brains under high daily processing load. Creapure® is the only third-party purity-certified creatine.
3–5g/day · Any time daily~£20 · 3–4 months~16p/day
Amazon
💧 Drink extra 500ml water daily when using creatine.
8
Methylated B-Complex
ADHDAutismMethylation
BioCare Methyl B Complex · Quatrefolic 5-MTHF + Methyl B12 + P-5-P B6 · 60 vegan caps · UK clinical grade
MTHFR variants are highly prevalent in ADHD and ASD cohorts — impairing the methylation cycle that produces dopamine, serotonin and norepinephrine. Methylfolate (Quatrefolic — the gold-standard form) bypasses MTHFR completely.
½–1 cap/day · Morning~£22 · 2–4 months
Amazon
⚠ Start at ¼–½ dose — AuDHD individuals are often more sensitive to methyl donors. Build slowly over 2–3 weeks.
9
Zinc + Selenium + Biotin
ADHDGutDopamine
Nutrition Geeks Biotin 10,000mcg + Zinc + Selenium · 180 vegan tablets · 6-month supply · 8,000+ reviews · UK Made
Zinc deficiency is significantly associated with ADHD severity — zinc is a direct cofactor for dopamine synthesis. Studies confirm zinc supplementation alongside stimulant medication allows dose reduction. Exceptional value for a 6-month supply.
1 tablet/day · With food~£10 · 6 months~6p/day
Amazon
⚠ Take with food — zinc on empty stomach causes nausea. Selenium max 200mcg/day.
10
Ashwagandha KSM-66
AllostaticBurnoutCortisol
Nutrition Geeks Ashwagandha KSM-66 3000mg + L-Tryptophan + B6 · 60 vegan caps · 2-month supply · 5,400+ reviews
The only supplement specifically targeting the masking-driven HPA axis hyperactivation — the upstream driver of AuDHD burnout. KSM-66 RCTs confirm significant cortisol reduction and improved stress resilience.
1 cap/day · Evening~£12 · 2 months~20p/day
Amazon
Phase 1 (Weeks 1–4)~£7/mo
+ Phase 2 (Weeks 4–8)+£18/mo
+ Phase 3 (Weeks 8–12)+£18/mo
+ Phase 4 (Week 12+)+£22/mo
Full Stack (10 supplements)~£65–85/mo
⚠ Important: This information is for educational purposes only and does not constitute medical advice. It is not a substitute for professional medical consultation, diagnosis or treatment. Always consult your GP before starting — particularly if you take stimulant medication (methylphenidate or amphetamines). Start at half dose and build slowly. Creatine requires increased daily hydration. Prices approximate as of May 2026.

Amazon affiliate disclosure: As an Amazon Associate, @ohdarlingitsbiology earns from qualifying purchases.