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The GABAergic system is the brain's main brake. Its protagonist is GABA (gamma-aminobutyric acid), the most abundant inhibitory neurotransmitter in the central nervous system: it reduces the excitability of neurons and counteracts glutamate, the excitatory accelerator. The balance between brake and accelerator determines whether the brain is calm or on alert.
What it is for. Adequate GABAergic tone translates into calm, less anxiety, muscle relaxation, ease of falling asleep, and a higher threshold against overexcitation. When the brake fails, anxiety, tension, insomnia, and irritability appear.
How it works. GABA acts on two receptors: GABA-A (fast, a chloride channel that calms the neuron; it is the target of benzodiazepines, alcohol, barbiturates, and some anesthetics) and GABA-B (slower and modulatory). An important nuance: GABA taken as a supplement crosses the blood-brain barrier poorly, so almost all strategies act indirectly.
What modulates it: amino acids and minerals such as L-theanine, magnesium, taurine, and glycine; plants such as valerian, passionflower, chamomile (apigenin), lavender (silexan), and ashwagandha; and CBD. Alcohol potentiates GABA-A acutely —that's why it relaxes—, but its chronic use downregulates the system and causes a rebound effect: more anxiety and insomnia.
It connects with neurotransmitters, stress, and sleep, and with goals such as anxiety, insomnia, and generalized anxiety disorder.
Information, not medical advice.