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If a supplement that everyone seems to love left you wired, anxious, flat or just off, your COMT result is one of the most useful things in your raw DNA file for understanding why. This guide covers what your COMT type tells you, where the research stands on the supplements most often linked to it, and how to use your result to choose with more confidence.
Updated October 2026 with the latest research on each supplement and how to find your COMT type in your raw DNA file.
What your COMT type tells you
COMT is the enzyme that clears dopamine, norepinephrine and adrenaline once they've done their job (UniProt). A common variant called Val158Met, ID rs4680, changes how quickly it works, and researchers have studied it since the 1990s. Raw DNA files list variants by ID, so search yours for rs4680 and you'll see two letters beside it:
- AA (Met/Met): the slower version, often called slow COMT.
- AG (Val/Met): in between, and the most common result.
- GG (Val/Val): the faster version, often called fast COMT.
The difference is measurable. In samples from outside the brain, the slow and fast forms differed three to four fold in enzyme activity (Lachman 1996), and in the prefrontal cortex, the part of the brain behind focus and planning, the fast form was about 38% more active (Chen 2004). It shows up in how people respond to medicine too: in a Parkinson's trial, the COMT-blocking drug entacapone added more "on" time for people with the fast version (Corvol 2011).
Among people of European ancestry, about 26% are AA, 47% AG and 26% GG (1000 Genomes, via Ensembl), and the shares vary by ancestry.
COMT in two minutes
COMT does much of the dopamine clearing in the prefrontal cortex (Chen 2004). Your liver, kidneys and blood make their own version, which also helps control some hormones (MedlinePlus).
To do that clearing, COMT borrows a methyl group from SAMe, your body's main methyl donor, and it needs magnesium to work (UniProt). That's why COMT sits at the center of so many conversations about methylation and supplements.
Your COMT type is one input among several. Hormones, sleep, stress, medication and other genes all shape how you feel, which is why a report that reads COMT alongside the rest of your methylation genes gives a fuller picture than one result on its own.
Where the research stands on each supplement
The biology of COMT is well established. Studies that look at supplements by COMT type are newer, and the picture is filling in as more of them are published. Here's where eight of the most talked-about supplements stand today:
Well established
Magnesium
COMT can't work without it.
How to use it: get enough from food first: leafy greens, nuts, seeds, beans and whole grains are good sources (NIH Office of Dietary Supplements).
+See the research
Magnesium is a required helper (cofactor) for the COMT enzyme (UniProt).
Well established
Methyl B12
Your body converts B12 forms, so you have a choice of which to take.
How to use it: if methyl B12 doesn't suit you, hydroxocobalamin and adenosylcobalamin are the forms the Noorns report lists first for slow COMT.
+See the research
Your body converts the common forms of B12 into the active forms it needs, including methylcobalamin (NIH Office of Dietary Supplements). That gives you a choice of forms.
Growing evidence
SAMe
The methyl donor COMT uses, and tested in slow-COMT carriers.
How to use it: talk to your doctor first if you have bipolar disorder or take serotonin-raising medication (NCCIH).
+See the research
SAMe is the methyl donor COMT uses. A trial that gave SAMe to 18 people who all carried the slower variant found less aggression and better quality of life, and two became more irritable (Strous 2009). In a depression trial, response was similar across COMT types (Sarris 2018).
Growing evidence
Methylfolate
Well tolerated in trials, with side effects at placebo rates.
How to use it: if you lean slow, start with the folate form your report suggests and add methylfolate gradually.
+See the research
Well tolerated in trials, with side effects at placebo rates at 15 mg a day (Papakostas 2012). In a study of 35 people given folic acid, those with slow COMT and the most common MTHFR type improved on a blood-vessel measure (Ellingrod 2015).
Growing evidence
TMG (betaine)
Lowers homocysteine, and your MTHFR type shapes the response.
+See the research
Betaine raised blood betaine and lowered homocysteine in a 2024 trial, and people's MTHFR type shaped how much it rose (Zawieja 2024), a good example of genes changing a supplement's effect.
Growing evidence
Caffeine
Raises adrenaline. In a sleep-loss study, slow COMT got more benefit.
How to use it: keep it moderate and earlier in the day, and go by how you feel.
+See the research
One 250 mg dose raised adrenaline by 207% in people who didn't usually drink coffee (Robertson 1978), which is more for COMT to clear. In a sleep-loss study of 37 adults, people with the slower variant were hit harder by lost sleep and got more benefit from caffeine at one point (Erblang 2021).
Growing evidence
Green tea extract (EGCG)
Slows COMT in the lab. In people, results were similar across COMT types.
How to use it: green tea as a drink is the easy route (NCCIH). Extracts at 800 mg of EGCG a day or more have raised liver enzymes in trials (EFSA 2018).
+See the research
EGCG slows COMT strongly in the lab (Nagai 2004). In people, a 750 mg dose left blood COMT activity higher two hours later (Lorenz 2014), and a year-long trial of 1,075 women, grouped by COMT type, found its effect was the same across the COMT groups (Samavat 2017).
Early research
Quercetin
Slows COMT in lab and animal studies.
+See the research
Quercetin slows COMT in the lab (Nagai 2004) and in animal studies (Zhu 1996), and it uses up methyl groups as COMT clears it.
Put together, the research points to a sensible way to start: use your COMT type to decide where to begin and how carefully to go, then let your own response guide the next step. That's how the Noorns reports that read COMT are built. They give you a starting list for your type, and the report text says it matters more to go by your symptoms than to try to treat a gene.
If you lean slow COMT (AA)
People on the slow side often describe getting overstimulated easily, stress that hangs around, or feeling wired but tired. Some find that strong methyl donors like methylfolate, methyl B12 or SAMe leave them restless, while others take them without trouble. A careful start lets you find out which group you're in:
- Begin with the gentler options your report suggests, and add methyl donors one at a time at a low dose.
- Watch your sleep for a few days after each change.
- Keep caffeine moderate and earlier in the day, since it adds to the load COMT has to clear.
- Get sleep, stress and regular meals steady before you judge any supplement.
If a supplement leaves you feeling like the left column in that chart, pause it and go back to the foundations before trying again. If symptoms feel strong or frightening, stop and talk to a clinician.
If you lean fast COMT (GG)
The fast side is often described as steady under pressure and flatter in calm stretches. The Noorns report's starting list for GG includes methylfolate, methyl B12 and SAMe, the same supplements it suggests slow-COMT readers introduce more gradually.
Green tea comes up often here because its catechins slow COMT in the lab. If you enjoy it, a few cups a day is the simple way to include it. Keep high-dose extracts in check, since they carry a liver caution, and remember green tea contains caffeine, so earlier in the day suits most people.
Warrior or worrier?
The labels come from a 2006 paper that proposed the fast version may help under stress and the slow version may help with memory and attention (Stein 2006). It's a memorable way to think about how the same gene can be an advantage in one situation and a challenge in another.
Later research has refined the picture. The link to anxiety-type traits turned out to depend on sex and ancestry (Lee and Prescott 2014), and the effects on everyday thinking tests are modest (Barnett 2008). So use the labels as a prompt to notice your own patterns, alongside the rest of your results.
Why the same supplement can feel amazing or awful
A useful way to think about supplement reactions is with two levers.
Lever 1: methyl load
Anything that adds methyl donors or methylation activity: methylfolate, methyl B12, SAMe, and many "methylated" formulas. For more on SAMe itself, see SAMe and methylation, and for the folate side, folate vs folic acid.
Lever 2: catechol load
Anything that raises stress chemistry: caffeine, intense stress, short sleep, and sometimes dopamine-boosting ingredients.
COMT sits between the two because it clears catechol-type chemicals using a methyl group. Green tea catechins and quercetin are also cleared by COMT, so they use up methyl groups along the way (Lu 2003, Zhu 1996). They belong on both levers.
If you're already running high on one lever, adding more can feel rough. If you're short on one, the right input can feel like relief. That's why you'll find opposite stories about the same supplement in the same COMT forum, and why your own genes and your own response together are the best guide.
Foundations first: sleep, stress, blood sugar and cofactors
Many supplement reactions happen when the body is already running hot from short sleep, ongoing stress or irregular meals. In those weeks, even something you normally tolerate can feel intense.
Sleep
When sleep is fragile, most people tolerate less stimulation of any kind. The timing of coffee, the timing of supplements and evening light all change how wired you feel.
Stress load
COMT conversations attract people who've lived with high stress for a long time. When stress is high, the body is less forgiving, and simple ways of winding down can matter more than any supplement.
Blood sugar
Low blood sugar can make you shaky, irritable and aware of a racing heart (NIDDK), which is easy to mistake for a supplement reaction. A regular meal rhythm with enough protein makes experiments easier to read.
Cofactors
COMT needs magnesium and a steady supply of SAMe to work, and keeping SAMe topped up depends on folate, B12 and choline from food (see the best foods for methylation). Getting those from food first gives any supplement you add a steadier base.
A low-risk way to test a supplement
- Start with your context. How are your sleep, stress and eating rhythm? If they're shaky, steady them first.
- Change one thing at a time. If you change three things, you can't tell what did what.
- Start lower than you think. You can always go up. A rough reaction is harder to undo.
- Track three things for a few days: sleep quality, how calm or revved you feel, and how steady your energy and focus are.
- Set stop rules before you begin. Strong anxiety, severe insomnia, palpitations or anything that feels frightening means stop and get medical advice.
- Return to baseline before the next test. Give your body time to settle.
- Bring your notes to a clinician, especially if you take medication. SAMe in particular can interact with medicines that raise serotonin (NCCIH).
Watch the webinar
This page started as the companion guide to our webinar, Understanding COMT: Why Some Supplements Make You Feel Great (And Others Terrible). Use the timestamps to jump to a topic.
- 00:00 Welcome and introductions
- 05:40 What COMT does in plain English
- 07:39 Val158Met (rs4680) and warrior vs worrier as a spectrum
- 11:43 Why supplements affect everyone differently
- 16:00 Slow COMT: a better approach
- 24:50 How a nutrigenomics report helps
- 29:05 Fast COMT patterns
- 35:35 Q&A
Slow and fast COMT supplements: quick answers
What supplements should you avoid with slow COMT?
Methylfolate, methyl B12 and SAMe are the ones most often named, and many people on the slow side do best adding them slowly, one at a time, starting from the gentler forms a report suggests. In the trial that gave SAMe specifically to slow-COMT carriers, the group showed less aggression and better quality of life. Separately from COMT, SAMe isn't for people with bipolar disorder or anyone on serotonin-raising medication without their doctor.
What are the best supplements for slow COMT?
Start with the foundations COMT runs on: enough magnesium, folate, B12 and choline from food, steady sleep and moderate caffeine. Then use your report's starting list and add one change at a time.
What supplements help fast COMT?
The Noorns report's starting list for fast COMT includes methylfolate, methyl B12 and SAMe. Green tea is a popular choice because its catechins slow COMT in the lab; a few cups a day is the easy route, while high-dose extract carries a liver caution.
Should you avoid coffee with slow COMT?
Not necessarily. Caffeine raises adrenaline, which COMT helps clear, so keep it moderate and earlier in the day and go by how you feel. In a sleep-loss study, slow-COMT carriers actually got more benefit from caffeine at one point.
Does green tea slow down COMT?
Its catechins slow COMT strongly in the lab. In people, the studies so far show similar results across COMT types.
How do I know if I have slow or fast COMT?
Look up rs4680 in your raw DNA file. AA is the slower version, GG the faster, and AG sits in between.
Is the worrier gene linked to anxiety?
Research suggests the link depends on sex and ancestry, so it's best read as one piece of a bigger picture.
