High stress, insufficient nutrients, fluctuating hormones and the use of stimulant medications or caffeine can all contribute to the depletion of serotonin over time. When serotonin is out of range, depression, anxiety, worry, obsessive thoughts and behaviors, carbohydrate cravings, PMS, difficulty with pain control, and sleep cycle disturbances can result.
GABA is the major inhibitory neurotransmitter found in the CNS and, as such, is important for balancing excitatory action of other neurotransmitters. High levels of GABA may result in a ‘calming’ action that may contribute to sluggish energy, feelings of sedation, and foggy thinking. Low GABA levels are associated with dysregulation of the adrenal stress response. Without the inhibiting function of GABA, impulsive behaviors are often poorly controlled, contributing to a range of anxious and/or reactive symptoms that extend from poor impulse control to seizure disorders.
DOPAMINE is largely responsible for regulating the pleasure reward pathway, memory and motor control. Its function creates both inhibitory and excitatory action depending on the dopaminergic receptor it binds to. Memory issues are common with both elevations and depressions in dopamine levels. Caffeine and other stimulants, such as medications for ADD/ADHD, often improve focus by increasing dopamine release, although continual stimulation of this release can deplete dopamine over time.
Common symptoms associated with low dopamine levels include loss of motor control, cravings, compulsions, loss of satisfaction and addictive behaviors including: drug and alcohol use, smoking cigarettes, gambling, and overeating. These actions often result from an unconscious attempt to self-medicate, looking for the satisfaction that is not occurring naturally in the body.
High dopamine may contribute to hyperactivity or anxiety and may also be related to autism, mood swings, psychosis and attention disorders. L-DOPA is a precursor to dopamine, and is used therapeutically for low dopamine conditions such as Parkinson’s disease. These medications can cause elevations in dopamine.
NOREPINEPHRINE, also called noradrenaline, is an excitatory neurotransmitter produced in the CNS, as well as a stress hormone produced in the adrenal medulla. Norepinephrine is involved in a wide variety of actions including attention, focus, regulating heart rate, affecting blood flow, and suppressing inflammation. Involved in arousal, it prepares the body for action by relaying messages in the sympathetic nervous system as part of the autonomic nervous system’s fight-or-flight response. High levels of norepinephrine are often linked to anxiety, stress, elevated blood pressure, and hyperactivity, whereas low levels are associated with lack of energy, focus, and motivation.
EPINEPHRINE, often better known as adrenaline, is synthesized from norepinephrine in both the CNS and the adrenal medulla. Much like norepinephrine, this excitatory neurotransmitter helps regulate muscle contraction, heart rate, glycogen breakdown, blood pressure and more, and is heavily involved in a stress response. Elevated levels of epinephrine are often associated with hyperactivity, ADHD, anxiety, sleep issues, and low adrenal function. Over time, chronic stress and stimulation can deplete epinephrine stores leading to difficulty concentrating, fatigue, depression, insufficient cortisol production, chronic stress, poor recovery from illness, dizziness and more.
GLUTAMATE is an excitatory neurotransmitter and is considered to be the most abundant neurotransmitter in the nervous system. Glutamate is involved in most aspects of normal brain function including cognition, memory and learning, although high levels of glutamate can cause excitotoxicity, a process where nerve cells are damaged by excessive stimulation. Elevated glutamate levels are commonly associated with panic attacks, anxiety, difficulty concentrating, OCD and depression, whereas low glutamate levels may result in agitation, memory loss, sleeplessness, low energy levels and depression.
GLYCINE is inhibitory and plays dual roles as both a neurotransmitter and an amino acid that serves as a building block of proteins. Glycine improves sleep quality, calms aggression, and serves as an anti-inflammatory agent. Glycine has been shown to boost mental performance and memory. Elevated glycine levels may be associated with compromised cognitive processing. Low levels of glycine may contribute to poor sleep, poor cognitive function, and issues with memory.
HISTAMINE is an excitatory neurotransmitter involved in the sleep/wake cycle and inflammatory response. Histamine plays a dual role in the body as both a neurotransmitter and immunomodulator increasing metabolism, promoting wakefulness, attention, circadian rhythms, learning, and memory. Elevated levels may be associated with allergy-like symptoms, gastro-intestinal concerns, and inflammation. Elevated histamine can interfere with sleep, contributing to insomnia. Low histamine may affect digestion and appetite control, learning, memory, and mood, and may result in drowsiness.
PEA (PHENETHYLAMINE) promotes energy, elevates mood, regulates attention and aggression, and serves as a biomarker for ADHD. Elevated PEA may contribute to anxiety, with very high levels having amphetamine-like effects. Elevated PEA levels may be associated with higher cortisol levels. Low PEA may be associated with ADHD, depression, Parkinson’s disease and bipolar disorder.