Ashwagandha Isn't Working? Your Genes May Explain Why.

COMT is an enzyme that breaks down catecholamines, the stress hormones. These include dopamine, norepinephrine, and epinephrine. When COMT is working properly, it clears these hormones efficiently, allowing your nervous system to downregulate after a stressful event and return to baseline. Think of it as your brain’s off-switch for adrenaline.

The Val158Met variant creates what’s called a ‘slow COMT’ function. Roughly 25% of people of European ancestry are homozygous for the slow variant. In these individuals, catecholamine clearance is significantly impaired. Stress hormones linger in your bloodstream and brain longer than they should, keeping you in a heightened state of arousal and reactivity even after the stressor has passed. You feel perpetually wired, unable to shift into parasympathetic mode, and your nervous system stays on high alert.

With slow COMT, your cortisol comes down eventually, but your dopamine and norepinephrine stay elevated. You’re anxious, your mind races, you can’t sleep deeply, and you feel like you’re always one small trigger away from panic. Ashwagandha may help with the cortisol piece, but it doesn’t address the catecholamine backup that keeps your prefrontal cortex overactive.

FKBP5 encodes a protein that directly controls your glucocorticoid receptor, the cellular lock that cortisol binds to. Under normal circumstances, when cortisol rises (as it should during stress), it binds to this receptor, and the receptor tells your pituitary gland to stop producing more cortisol. This is negative feedback, and it’s critical for turning off the stress response. FKBP5 helps regulate this loop.

The rs1360780 variant disrupts this negative feedback mechanism. Roughly 30% of people carry at least one copy of this variant. When you experience stress, your cortisol rises, but your glucocorticoid receptor is less sensitive to that signal, so the off-switch doesn’t fully engage. Your body keeps pumping cortisol even though there’s already plenty in circulation. After the stressor is gone, it takes much longer for cortisol to come back down. You stay in a prolonged stress state, sometimes for hours or days after a single triggering event.

This is particularly dangerous because cortisol itself feeds back to make the FKBP5 variant worse. Chronic stress creates a vicious cycle where your stress response becomes increasingly dysregulated. You feel constantly exhausted but wired, your immune system becomes suppressed, and your ability to bounce back diminishes. Ashwagandha works partly by improving HPA axis signaling, but if your receptor sensitivity is genetically impaired, the signal won’t be strong enough.

SLC6A4 encodes the serotonin transporter, the protein that recycles serotonin back into neurons after it’s been released. Serotonin is your brain’s primary mood buffer and anxiety regulator. When serotonin signaling is working well, you feel emotionally stable, you handle stress without catastrophizing, and your mood stays relatively consistent. The transporter is the rate-limiting step in serotonin recycling, so if this transporter is inefficient, serotonin gets depleted quickly.

The 5-HTTLPR short allele reduces the expression of this transporter, meaning less efficient serotonin recycling. Roughly 40% of the population carries at least one copy of the short allele. Under stress, your serotonin availability drops faster and more dramatically than it should, leaving you emotionally vulnerable and prone to rapid mood deterioration. You feel calm when life is stable, but even a moderate stressor triggers disproportionate anxiety, and you struggle to recover emotionally afterward.

With this variant, ashwagandha’s benefits may be partial because ashwagandha doesn’t directly increase serotonin synthesis. It works on GABA and the HPA axis, but if your serotonin is depleted, you’ll still feel anxious and mood-reactive even after taking it. Your brain simply doesn’t have enough of the neurotransmitter that buffers stress.

MAOA is an enzyme that breaks down monoamine neurotransmitters, including serotonin, dopamine, and norepinephrine. The pacing at which MAOA breaks down these neurochemicals directly affects your emotional baseline and stress reactivity. A faster MAOA clears neurotransmitters quickly, sometimes leaving you with less available for mood and stress buffering. A slower MAOA allows neurotransmitters to accumulate, which can improve mood but can also create unpredictable emotional swings and heightened reactivity.

The MAOA-L (low-activity) variant is carried by roughly 30-40% of males. This variant slows MAOA function, leading to neurotransmitter accumulation. You experience heightened emotional sensitivity and more intense reactions to environmental stimuli, both positive and negative. You’re more easily triggered, more prone to emotional flooding, and more reactive to social cues. Under chronic stress, this accumulation can shift from advantageous to overwhelming as your neurotransmitter levels become dysregulated.

When you take ashwagandha with a MAOA-L variant, you may experience unpredictable effects because you’re already carrying higher baseline neurotransmitter levels. Ashwagandha’s calming properties might help, but if you also have a slow SLC6A4, the serotonin accumulation can become problematic. Your system needs support not just for calm, but for regulation and emotional equilibrium.

BDNF, brain-derived neurotrophic factor, is essentially your brain’s repair and resilience molecule. When you experience stress, your brain needs to adapt, rewire connections, and recover. BDNF makes that possible. It supports neuroplasticity, allows your prefrontal cortex to dampen amygdala reactivity, and enables you to integrate stressful experiences and move forward. People with high BDNF feel stress, but they recover quickly and don’t get stuck in rumination or fear conditioning.

The Val66Met variant reduces BDNF secretion. Roughly 30% of people carry at least one copy of the Met allele. This impairs your brain’s ability to adapt to stress and recover from it, leaving you stuck in a stress state longer than you should be. After a stressful event, your thoughts circle. You replay the event, you catastrophize, and your amygdala stays activated even though the danger has passed. Your brain can’t reset itself efficiently.

With this variant, ashwagandha’s immediate cortisol-lowering effects may feel helpful in the moment, but your brain’s underlying ability to bounce back is compromised. You need interventions that actually drive BDNF production: exercise (especially aerobic and strength training), sauna exposure, and certain nootropic compounds. Ashwagandha alone won’t restore your resilience architecture.

NR3C1 encodes the glucocorticoid receptor itself, the actual cellular lock that cortisol binds to. This is different from FKBP5, which regulates the receptor. NR3C1 controls how well your cells respond to cortisol in the first place. If your glucocorticoid receptors are less sensitive to cortisol (poor functionality), then even when cortisol levels are appropriate, your cells don’t respond as expected, leading to impaired stress adaptation and recovery.

Certain NR3C1 variants reduce glucocorticoid receptor function. Roughly 20-30% of people carry variants that affect receptor sensitivity. Your cells are less responsive to cortisol signaling, meaning cortisol levels may appear normal on a lab test, but your tissues aren’t receiving the signal properly. You feel stressed and stuck even though your cortisol isn’t technically elevated. Your immune cells, your neural tissue, and your metabolic cells all fail to respond to cortisol’s organizing effects.

With this variant, ashwagandha’s benefits are muted because ashwagandha works partly through improving glucocorticoid receptor signaling. If your receptors aren’t working well in the first place, ashwagandha’s signal gets lost. You need interventions that restore receptor sensitivity, such as sleep optimization, consistent strength training, and foods high in polyphenols.