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Coluracetam
Coluracetam (MKC-231) is a synthetic racetam nootropic that enhances high-affinity choline uptake (HACU) in the brain. Originally developed in Japan for Alzheimer's research, it is valued by nootropic users for its reported effects on memory, colour perception, and mood.
Benefits
What is Coluracetam?
Coluracetam (chemical name: 2-(2-oxopyrrolidin-1-yl)-N-(2,3-dimethyl-5,6,7,8-tetrahydrofuro[2,3-b]quinolin-4-yl)acetoamide, also known as MKC-231 or BCI-540) was developed by Mitsubishi Tanabe Pharma in Japan and later licensed to BrainCells Inc. for further development. It was originally investigated as a treatment for Alzheimer's disease and later for major depressive disorder with generalised anxiety disorder.
Coluracetam is unique among racetams in that its primary mechanism appears to be the enhancement of high-affinity choline uptake (HACU) - the rate-limiting step in acetylcholine synthesis. While other racetams modulate acetylcholine activity through various receptor interactions, coluracetam targets the choline transporter itself, potentially offering a more fundamental enhancement of cholinergic function.
Despite limited formal clinical trials, coluracetam has gained a following in the nootropic community. Users frequently report enhanced colour vision, improved visual clarity, and a sense of calm focus that distinguishes it from more stimulating racetams like oxiracetam or phenylpiracetam. These subjective reports of visual enhancement are particularly interesting and relatively unique among nootropics.
- High-affinity choline uptake (HACU): Coluracetam enhances the activity of the high-affinity choline transporter (CHT1) in cholinergic neurons, increasing the rate at which choline is taken up for acetylcholine synthesis. This effect persists even after the drug has been cleared from the system.
- Acetylcholine enhancement: By boosting the rate-limiting step of ACh synthesis, coluracetam may increase acetylcholine production more fundamentally than racetams that simply modulate receptor activity.
- AMPA receptor potentiation: Like other racetams, coluracetam may act as a positive allosteric modulator of AMPA receptors, enhancing glutamatergic neurotransmission and supporting synaptic plasticity.
- Visual processing: The reported enhancement of colour perception and visual clarity may relate to cholinergic enhancement in the visual cortex, though this mechanism is not well studied.
- Neuroprotection: In animal models of cholinergic neurotoxicity (AF64A lesions), coluracetam restored HACU activity and improved learning deficits, suggesting protective effects on cholinergic neurons.
- Typical dose: 20-80 mg per day, divided into 2-3 doses
- Starting dose: 20 mg per day to assess tolerance and response
- Common protocol: 20-35 mg taken 2-3 times daily
- Sublingual use: Some users take coluracetam sublingually for enhanced absorption, as it is fat-soluble and may benefit from bypassing first-pass metabolism
- Fat-soluble: Take with a fat source (meal, fish oil, or MCT oil) for improved absorption
Coluracetam is active at much lower doses than piracetam. Start low and adjust gradually. Effects may be subtle initially and build over days of consistent use.
- Limited research: Coluracetam has very limited clinical data in humans. Two Phase 2a trials for depression/anxiety showed some promise but were small and results were mixed.
- Side effects: Reported side effects from user experiences include headache (often mitigated by choline supplementation), fatigue, and mild anxiety at higher doses.
- Regulatory status: Not approved as a pharmaceutical anywhere. Unregulated in most countries. Not a controlled substance.
- Drug interactions: No formal interaction studies. Exercise caution with cholinergic or anticholinergic medications.
- Pregnancy: No safety data. Avoid during pregnancy and breastfeeding.
Due to very limited human research, coluracetam should be approached with caution. Source only from reputable vendors with third-party testing.
Natural Sources & Forms
- Synthetic compound: Coluracetam does not occur naturally and must be synthesised
- Bulk powder: Available from specialty nootropic vendors, often in small quantities
- Capsules: Some vendors offer pre-measured capsules
- Solution: Liquid solutions for sublingual use are available from some suppliers
- Quality note: Due to its niche status, quality control is especially important. Only purchase from vendors with certificates of analysis.
Frequently Asked Questions
Coluracetam (MKC-231) is a synthetic racetam nootropic that enhances high-affinity choline uptake (HACU) in the brain. Originally developed in Japan for Alzheimer's research, it is valued by nootropic users for its reported effects on memory, colour perception, and mood.
The key benefits of Coluracetam include: Anxiety & Calm, Cognitive Enhancement, Creativity, Focus, Memory, Mood.
High-affinity choline uptake (HACU): Coluracetam enhances the activity of the high-affinity choline transporter (CHT1) in cholinergic neurons, increasing the rate at which choline is taken up for acetylcholine synthesis. This effect persists even after the drug has been cleared from the system. Acetylcholine enhancement: By boosting the rate-limiting step of ACh synthesis, coluracetam may increase acetylcholine production more fundamentally than racetams that simply modulate receptor activity. AMPA receptor potentiation: Like other racetams, coluracetam may act as a positive allosteric modulator of AMPA receptors, enhancing glutamatergic neurotransmission and supporting synaptic plasticity. Visual processing: The reported enhancement of colour perception and visual clarity may relate to cholinergic enhancement in the visual cortex, though this mechanism is not well studied. Neuroprotection: In animal models of cholinergic neurotoxicity (AF64A lesions), coluracetam restored HACU activity and improved learning deficits, suggesting protective effects on cholinergic neurons.
Typical dose: 20-80 mg per day, divided into 2-3 doses Starting dose: 20 mg per day to assess tolerance and response Common protocol: 20-35 mg taken 2-3 times daily Sublingual use: Some users take coluracetam sublingually for enhanced absorption, as it is fat-soluble and may benefit from bypassing first-pass metabolism Fat-soluble: Take with a fat source (meal, fish oil, or MCT oil) for improved absorption Coluracetam is active at much lower doses than piracetam. Start low and adjust gradually. Effects may be subtle initially and build over days of consistent use.
Limited research: Coluracetam has very limited clinical data in humans. Two Phase 2a trials for depression/anxiety showed some promise but were small and results were mixed. Side effects: Reported side effects from user experiences include headache (often mitigated by choline supplementation), fatigue, and mild anxiety at higher doses. Regulatory status: Not approved as a pharmaceutical anywhere. Unregulated in most countries. Not a controlled substance. Drug interactions: No formal interaction studies. Exercise caution with cholinergic or anticholinergic medications. Pregnancy: No safety data. Avoid during pregnancy and breastfeeding. Due to very limited human research, coluracetam should be approached with caution. Source only from reputable vendors with third-party testing.
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