About the Product

Life Pro Nutrition's GABA (Essentials line) is a food supplement in VCAPS vegetable capsules formulated with 750 mg of gamma-aminobutyric acid (GABA) per capsule, as a single ingredient format without unnecessary additives. GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter of the mammalian central nervous system, synthesized endogenously from glutamate (the main excitatory neurotransmitter) by the enzyme glutamate decarboxylase (GAD), in one of the most elegant balance relationships of the nervous system: the two neurotransmitters with the highest quantitative expression in the brain are mutually antagonistic, and the glutamate/GABA balance regulates the tone of global neuronal excitability. Oral GABA supplementation is used to support sleep, reduce stress and anxiety, and stimulate growth hormone (GH). 1 to 2 capsules/day, 30 minutes before bedtime. Vegan.

Benefits

GABA: the main inhibitory neurotransmitter of the CNS and the central regulator of neuronal excitation/inhibition balance:

Gamma-aminobutyric acid (GABA) is a 4-carbon amino acid that, unlike most amino acids present in the body, primarily functions as a neurotransmitter and not as a substrate for protein synthesis. It is the predominant inhibitory neurotransmitter in the human brain, with estimates that 30 to 40% of all brain neurons use GABA as a neurotransmitter. It acts via two main types of receptors: GABA-A receptors (ionotropic: ligand-gated chloride channel, which when activated by GABA allows Cl⁻ entry into the cell, hyperpolarizing the neuron and making it less excitable, with a rapid onset of action in milliseconds) and GABA-B receptors (metabotropic: coupled to Gi/Go protein, which via a second messenger inhibit adenylyl cyclase, increase K⁺ conductance and reduce Ca²⁺ conductance, with a slower onset of action but a more prolonged effect). Activation of GABA-A and GABA-B receptors reduces neuronal excitability, decreases neuronal firing frequency, and has anxiolytic, sedative, and hypnotic effects that are the basis of action for multiple drugs: benzodiazepines (diazepam, lorazepam), barbiturates, ethanol, and most general anesthetics all act as positive allosteric modulators of GABA-A receptors, potentiating the action of endogenous GABA.

The blood-brain barrier issue and the central bioavailability of oral GABA:

A relevant scientific debate on oral GABA supplementation concerns the ability of exogenous GABA (ingested orally) to cross the blood-brain barrier (BBB) in clinically relevant amounts. The BBB is a selective barrier formed by specialized endothelial cells of brain capillaries, which restricts the passage of hydrophilic and ionized molecules from the blood to nerve tissue. GABA, being a zwitterionic amino acid (with a positive charge on the amino group and a negative charge on the carboxylate group at physiological pH) and relatively hydrophilic, has limited permeability through the BBB. Initial studies in the 1970s to 1990s suggested that the central penetration of oral GABA was negligible. However, more recent research has documented alternative mechanisms: GABA can cross the BBB via amino acid transporters (especially the neutral amino acid transporter GAT) in modest but measurable amounts, and can also act via GABA-A receptors present in the peripheral nervous system and the vagus nerve (activating vagal reflexes that have an indirect impact on the CNS). The clinical study by Yoto et al. (2012), published in Amino Acids, documented that 100 mg of oral GABA significantly reduced alpha and beta brain waves in EEG (associated with anxiety and stress) and improved cellular immune response compared to placebo, suggesting a measurable central effect. Studies by Kimura et al. (2019) documented improved sleep quality with oral GABA supplementation at 300 mg/day for 4 weeks, with an increase in deep sleep time.

Reduction of stress and anxiety: the most documented mechanism in the context of supplementation:

GABA is the main mediator of the anxiolytic and stress-reducing response in the CNS. In situations of acute or chronic stress, the activity of excitatory systems (glutamate, noradrenaline, CRF/HPA system) increases, and GABA acts as a natural "brake" system for this hyperexcitability. GABA supplementation has documented effects in reducing physiological markers of stress: decreased heart rate, blood pressure, and electrodermal response (skin conductance) in situations of acute stress; and reduced plasma cortisol levels and subjective perception of anxiety in clinical trials with simulated mental stress (such as solving complex math problems under time pressure, one of the most used stress induction tasks in neuroscience). The study by Abdou et al. (2006) documented that 100 mg of GABA attenuated the increase in stress brain waves and promoted a state of relaxation, while the study by Byun et al. (2014) documented an improvement in stress markers in students during an exam period.

Improved sleep quality: relaxation without sedation:

Unlike drugs that act on GABA-A receptors (benzodiazepines, which cause pharmacological sedation and REM sleep suppression), oral GABA supplementation at supplement doses (750 to 1500 mg/day) does not cause daytime sedation, but contributes to the quality of nocturnal sleep through a mechanism of progressive relaxation: the reduction of neuronal excitability and levels of anxiety/cognitive hyperactivation that often prevent falling asleep (the so-called "overthinking" or pre-sleep rumination) allows a more natural transition to sleep, with a shorter sleep latency and a greater proportion of slow-wave sleep (deep sleep). This difference in action profile compared to benzodiazepines is clinically relevant: GABA does not compromise sleep architecture or cause physical dependence or tolerance with prolonged use.

Stimulation of growth hormone (GH): the ergogenic effect relevant for athletes:

Several studies document that GABA supplementation can stimulate the secretion of GH (growth hormone, somatotropin) by the pituitary gland. The study by Powers et al. (2008) documented that 3 g of oral GABA increased resting plasma GH levels by 400% and post-exercise levels by 200% compared to placebo. GH has multiple anabolic and lipolytic effects relevant for athletes: it stimulates muscle protein synthesis (via IGF-1/somatomedin C), promotes lipolysis (release of fatty acids from adipose tissue for use as fuel), supports post-workout muscle recovery and repair, and has anabolic effects on bone and connective tissue (collagen). The peak of endogenous GH secretion occurs during deep sleep phases (slow waves), and the combination of the effect of improved deep sleep with the direct GH stimulating effect makes GABA particularly interesting for athletes who take the supplement before bedtime.

Immune system support through sleep quality:

Sleep deprivation has profoundly negative effects on immune function: it reduces NK cell (natural killer) activity, decreases antibody production in response to vaccination, increases the production of pro-inflammatory cytokines (IL-6, TNF-α), and reduces T-lymphocyte response to mitogens. By improving sleep quality and duration, GABA supplementation indirectly contributes to the maintenance of optimal immune function, especially relevant in athletes with high training loads (who are particularly susceptible to overtraining immunosuppression).

Uses

Recommended dose: Take 1 to 2 capsules/day (750 to 1500 mg of GABA), 30 minutes before the last meal of the day or 30 minutes before bedtime. Taking it before sleep is the most appropriate time to simultaneously take advantage of the effects of improved sleep, reduced pre-sleep excitability, and stimulation of nocturnal GH secretion. For those with higher sensitivity, start with 1 capsule (750 mg) and evaluate the response before increasing to 2 capsules.