Acetyl-L-Carnitine (ALCAR)
Acetylated carnitine that crosses the blood-brain barrier to fuel mitochondrial energy and donate acetyl groups for acetylcholine synthesis.
Acetyl-L-Carnitine (ALCAR) is an acetylated form of L-carnitine that readily crosses the blood-brain barrier. It supports mitochondrial energy production in the brain, provides acetyl groups for acetylcholine synthesis, and has neuroprotective properties. Research shows benefits for cognitive function, mood, and age-related mental decline.
Supports mitochondrial function in brain cells
Provides acetyl groups for neurotransmitter synthesis
Protects brain cells from damage
How Acetyl-L-Carnitine works β from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta β pathways are being refined and expanded.
500-2000mg
Can be taken without food
| Form | Type |
|---|---|
| πALCAR powder or capsules | Recommended |
| πALCAR HCl | Alternative |
Powder is cost-effective for higher doses. Has a slightly sour taste if taken as powder.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Can be energizing β avoid evening dosing. Can be taken on empty stomach. Often split into 2 doses.
Clearer thinking and better focus
Better recall and learning
May improve mood and reduce mental fatigue
Insufficient data; avoid unless medically advised
May be particularly beneficial; start with lower doses
May reduce thyroid hormone effectiveness
May have mild anticoagulant effects β may affect platelet aggregation or vitamin K-dependent clotting factors, altering anticoagulant efficacy
May affect seizure control
Tip: Take with food; start with lower dose
Tip: Take earlier in day; reduce dose
Tip: Reduce dose
Both support acetylcholine through different mechanisms
Enhanced cognitive function and memory
Both support mitochondrial function
Synergistic energy and neuroprotective effects
Different roles in mitochondrial energy production
Comprehensive mitochondrial support
Both support mitochondrial function
Multi-target cellular energy support
Top studies from 40+ peer-reviewed papers
Wadman RI et al. β’ The Cochrane database of systematic reviews (2020)
βNusinersen improves motor function in SMA type II, based on moderate-certainty evidence.β
Rolim LC et al. β’ The Cochrane database of systematic reviews (2019)
βWe are very uncertain whether ALC causes a reduction in pain after 6 to 12 months' treatment in people with DPN, when compared with placebo, as the evidence is sparse and of low certainty.β
Scafuri L et al. β’ Nutrients (2025)
βHowever, the evidence is mixed across supplement types, and further research is needed to determine the most effective and safe approaches.β
Niu C et al. β’ Reproductive sciences (Thousand Oaks, Calif.) (2025)
βCoQ10 was the most effective intervention measure for improving sperm concentration, and L-carnitine was regarded as the best treatment method for enhancing sperm motility.β
Zhou P et al. β’ PloS one (2024)
βThe rankings of safety and efficacy of the 12 antioxidants vary.β
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