9-ME-BC
9-Methyl-β-Carboline
9-Methyl-β-Carboline (9-ME-BC) is a synthetic methylated derivative of the naturally occurring β-carboline norharman, investigated primarily as a dopaminergic neuroprotective and neurorestorative agent. It has attracted research interest for its potential to enhance dopamine synthesis, support neuronal growth, and improve cognitive function, particularly in contexts of dopaminergic deficit. Most human use is experimental and extrapolated from in vitro and rodent studies, with no approved clinical applications.
Mechanism of Action
9-ME-BC inhibits monoamine oxidase (MAO-A and MAO-B), thereby reducing dopamine degradation and increasing synaptic dopamine availability. It additionally upregulates tyrosine hydroxylase expression—the rate-limiting enzyme in dopamine biosynthesis—and has demonstrated promotion of dopaminergic neuronal differentiation and neuroprotection against neurotoxic insults in cell culture models. It also exhibits BDNF and GDNF-like trophic effects and may modulate NMDA receptor activity, contributing to its purported procognitive and neuroprotective profile.
Evidence by Health Goal(6 goals)
Dosing Protocols
Morning, with or without food
Cycle: 4-8 weeks on, 4 weeks off
Start at 5mg to assess tolerance. The MAO-inhibiting properties necessitate cycling and dietary caution. Human dosing is entirely anecdotal; no established clinical dose exists. Powder form is most common; capsules are preferred for accurate dosing.
Morning, fasted state
Cycle: 4-8 weeks on, 4 weeks off
Sublingual administration may improve bioavailability relative to oral due to first-pass avoidance. Hold under tongue for 60-90 seconds. Bitter taste is prominent. Dose should be reduced compared to oral if enhanced absorption is confirmed.
Safety & Side Effects
9-ME-BC has no human clinical trial safety data and its long-term toxicity profile in humans is unknown; all use is experimental and carries meaningful uncertainty. Its MAO-inhibitory activity creates real risks of hypertensive reactions with tyramine-rich foods and serotonergic drugs, and it should be treated with the same dietary and drug interaction precautions as classical MAOIs. It is not a controlled substance in most jurisdictions but is unscheduled and sold as a research chemical, meaning quality control is variable.
Possible Side Effects
- !Anxiety or restlessness, particularly at higher doses
- !Insomnia or sleep disturbances when taken late in the day
- !Headache, especially during initial use or dose escalation
- !Elevated blood pressure due to MAO inhibition and increased catecholamine levels
- !Gastrointestinal discomfort including nausea at higher doses
- !Potential photosensitivity—β-carbolines may sensitize skin to UV radiation
- !Mood dysregulation or irritability during cessation after extended cycling
- !Theoretical excitotoxicity risk with prolonged high-dose use based on NMDA modulation data
Interactions
- -Contraindicated with serotonergic drugs (SSRIs, SNRIs, tramadol, triptans)—risk of serotonin syndrome due to MAO inhibition
- -Tyramine-containing foods (aged cheese, cured meats, fermented products) may trigger hypertensive crisis via MAO-B inhibition
- -Additive dopaminergic effects with L-DOPA, dopamine agonists, or stimulants—may increase cardiovascular and psychiatric risk
- -May potentiate CNS stimulant effects of caffeine or other methylxanthines, increasing anxiety and blood pressure
- -Use with other β-carbolines (harmine, harmaline from ayahuasca or supplements) may cause excessive MAO inhibition and unpredictable psychoactive effects
Cost & Where to Buy
Sold exclusively as a research chemical in powder form; typical quantities are 100-500mg from specialty vendors. Price varies significantly by vendor, purity certification (HPLC), and quantity purchased. A 100mg supply at 10mg/day covers approximately 10 days, so monthly costs depend heavily on dose. Purity and authenticity are significant concerns given the unregulated market.
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