howtosupplement
Performance/Hormonal/Cognition

Sulbutiamine

Synthetic thiamine derivative studied for chronic fatigue and erectile dysfunction, with limited but promising older clinical data in specific populations.

Sulbutiamine

Sulbutiamine

40
score
C
evidence
Caution
risk

Proven Benefits

01Reduces fatigue/asthenia
02May improve erectile function
03May support memory/attention

Chemical Forms

Recommended
  • Sulbutiamine
Avoid
  • Thiamine HCl (standard B1 does not provide equivalent central penetration)
Expert Note

Sulbutiamine is a specific lipophilic dimer of thiamine designed to cross the blood-brain barrier. Standard thiamine salts such as HCl or mononitrate have poor central penetration and are not substitutes for the nootropic or anti-asthenic effects studied with sulbutiamine.

Protocol

Amount
200-600 mg
Frequency
Once daily, or split into two doses
When
Morning and early afternoon; avoid late-day dosing to prevent sleep disturbance.

Condition-Based Dosing

Chronic asthenia or fatigue
200 mg twice daily for 4 weeks
Psychogenic erectile dysfunction
200 mg twice daily for 4-6 weeks

Safety & Limits

Upper Safe Limit
600 mg/day (highest studied dose; no official UL established)
Cycling
8-12 weeks on, 2-4 weeks off; reassess need after each cycle

Contraindications

Bipolar disorder or mania history — dopaminergic modulation may trigger mood episodes
Pregnancy and breastfeeding — insufficient safety data
Schizophrenia or psychotic disorders — theoretical risk from dopamine modulation

Synergies

Magnesium

Magnesium supports thiamine-dependent enzymes and may enhance overall energy metabolism.

B-complex

Other B-vitamins work synergistically in mitochondrial energy pathways.

Avoid Combining With

  • ✕Alcohol (chronic use depletes thiamine and may blunt effects)
  • ✕Coffee or tea within 1 hour (tannins may theoretically reduce absorption — separate timing)
Updated Invalid Date