Understanding it
What anxiety and low mood actually are
Anxiety, irritability and low mood exist on a spectrum, and many people experience them together — wired and flat at the same time, or cycling between the two. Anxiety shows up as a nervous system that won't settle: racing thoughts, physical tension, a startle response that's always on. Low mood shows up as flatness, loss of interest, and a sense that everything takes twice the effort it should. Irritability often sits between them, a short fuse born of a system that's both depleted and overstimulated. These are real, physiological states driven by neurotransmitter levels and the body's stress response — not character flaws or willpower failures.
The roots
What might be causing it
Neurotransmitter production and clearance are governed by a relatively small set of genes, and methylation supplies the raw materials for all of them. A slow COMT variant keeps adrenaline and dopamine circulating longer, which can feel like anxiety, restlessness, and an inability to switch off. A slow MTHFR variant starves serotonin synthesis of the methyl groups it needs, which can show up as low mood and poor stress resilience. MAOA variants change how quickly serotonin and dopamine are broken down. The SLC6A4 transporter gene affects serotonin reuptake. On top of genetics, chronic stress, blood-sugar swings, gut inflammation, histamine load, and nutrient shortfalls (magnesium, B6, B12, omega-3) all shift the baseline. The key insight is that "anxiety" and "low mood" can have opposite biochemical roots — and the support that helps one pattern can worsen another.
The standard path
How it's usually treated
The most common medical approach is medication that acts on neurotransmitter levels. SSRIs (sertraline, escitalopram, paroxetine, fluoxetine) and SNRIs (venlafaxine, duloxetine) are typically first-line for both anxiety and depression, working to raise serotonin and noradrenaline signaling. For acute anxiety or sleep, benzodiazepines may be prescribed short-term. For more treatment-resistant cases, atypical antidepressants like bupropion or mirtazapine are added or substituted. These medications can be genuinely helpful — but they're largely chosen by trial and error, and the genes that decide how you metabolize them (CYP2D6 and CYP2C19) vary widely. A slow metabolizer can build up levels several times higher than expected, experiencing agitation, insomnia, or worsening of the very symptoms the drug was meant to treat. A fast metabolizer may clear the drug so quickly that a standard dose never reaches a therapeutic level, and the medication appears to "not work." This trial-and-error can take months and several medication changes before landing on something that helps.
A different angle
How genetic screening can help
Genetic screening works on two fronts here. First, it identifies the neurotransmitter-handling pattern you carry — slow COMT, slow MTHFR, MAOA and SLC6A4 variants — so nutrient support can be matched to your actual biochemistry rather than guessed. A slow-COMT pattern often responds to magnesium, B6 (P5P), and L-theanine with methyl donors introduced gently; a pattern pointing to low serotonin synthesis may benefit from methylfolate and the right B12. Second, pharmacogenomic genes like CYP2D6 and CYP2C19 predict how you'll handle common SSRIs and SNRIs — so if you and your doctor do choose or adjust a medication, you can start with one your body is more likely to metabolize well, at a dose matched to your metabolism, instead of cycling through several by trial and error. The aim is to support the underlying neurotransmitter chemistry with targeted nutrients — which for many people reduces the severity of symptoms and, in some cases, the need for medication — while giving any prescribed medication the best chance of working the first time.
This is educational support, not a diagnosis or a treatment plan. We help you understand genetic tendencies and support them with food, lifestyle and nutrients alongside your doctor. Never stop or change a prescribed medication without your prescribing clinician.
