How to improve focus and concentration: science tools

Focus is not a switch you flip. It is a skill built on three neurochemicals and trained through repetition. This guide, based on a Huberman Lab Essentials episode, explains how focus works in the brain and which behavioral, nutritional and supplement tools can improve it.

How focus works: the arrow model

Picture an arrow. The shaft is epinephrine, also called adrenaline, released by the locus coeruleus in the brain and by the adrenal glands. Epinephrine raises energy and alertness. It is necessary for focus but not enough on its own.

The arrowhead is acetylcholine, which acts like a spotlight that highlights the neurons that should be more active than the rest. A narrow arrowhead points at one target. Dopamine, the molecule of motivation, keeps you going. Together these three let you narrow your focus over time and repeat it whenever you need.

Build the foundation

Sleep and sound

Aim for quality sleep on about 80 percent of nights. Sleep modulates nearly every process in the brain and body. Once sleep is in place, white noise and, to some extent, pink and brown noise can amplify prefrontal cortex activity. They do not improve concentration itself, but they shorten the time it takes to drop into a focused state.

Work in 90 minute bouts

Focus is not a step function. You move from shallow to deep focus, just as you warm up before a run. Brain and body run on 90 minute ultradian cycles, so the ideal focused bout lasts about 90 minutes, including a 5 to 10 minute warm up. Treat it like a workout, and be patient with yourself, because repetition etches focus circuits through neuroplasticity.

Fasted or fed

Neurons use glucose, and a study in Neuron showed they represent the environment more precisely when glucose is sufficient. Still, many people feel clear when fasted, as long as they are hydrated and have electrolytes. After a big meal, blood flows to the gut and you get sleepy. Huberman does his first 90 minute bout fasted with water and electrolytes, eats around 11 a.m., and does another bout in the afternoon. Avoid overeating at lunch.

Caffeine

Caffeine from 100 to 400 milligrams helps focus. Most people do well with 100 to 200 milligrams before focused work. If you have anxiety or panic attacks, start low. Stop caffeine at least 8 hours before bed, ideally 10 to 12, because it disrupts sleep architecture.

Use stress and cold on purpose

A 2020 paper in Experimental Psychology found that acute stress improved concentration performance by more than double. Stress releases adrenaline, which narrows your visual field and sharpens the arrow.

A safer way to trigger this is deliberate cold exposure. A cold shower or cold water for 1 to 5 minutes, uncomfortably cold but safe, raises epinephrine and can nearly double dopamine for hours, according to a study in the European Journal of Physiology.

Train your focus directly

A 13 minute meditation

Wendy Suzuki's lab found that 13 minutes of daily meditation for 8 weeks improved focus, mood, sleep and memory, and reduced stress. Set a timer, sit or lie down, close your eyes and breathe through your nose. Bring your awareness to a point about an inch inside your forehead. Your mind will drift every 5 to 20 seconds. That is the point: each return to the breath is a repetition that trains the prefrontal cortex, the inferotemporal cortex and the hippocampus.

Visual focus

Vision directs much of your attention. Pick a target on a wall or a piece of paper, stare at it for 30 seconds to 3 minutes, blink normally and refocus whenever your gaze drifts. Start with 30 seconds and add 5 seconds each day. Use it before a 90 minute bout, and again if your focus fades midway, instead of reaching for your phone.

Compounds that support focus

• Omega-3 EPA: 1 to 3 grams per day supports mood and cognition.
• Creatine monohydrate: 5 grams per day fuels prefrontal cortex networks.
• Alpha GPC: 300 to 600 milligrams before a workout or mental work raises acetylcholine. A recent study linked chronic use to stroke risk through TMAO, though the data are not conclusive. Huberman takes it about four days a week with a 600 milligram garlic capsule.
• L-tyrosine: 500 milligrams raises dopamine. He pairs it with 300 milligrams of alpha GPC and a coffee early in the day.

Combine no more than two or three tools at once. Use them to train deeper focus so you need them less over time.

Prescription drugs and defocusing

Stimulants such as Adderall or Ritalin help people with diagnosed ADHD and may teach neural circuits to engage. Using them without a prescription is illegal and risky. Start with behavior, nutrition and sleep, then supplements, and only then prescription options.

Finally, defocus daily. Daydream or walk without your phone, so your brain can focus better next time.

Conclusion

Focus improves when you repeat the act of refocusing. Pick one or two tools, practice them consistently and protect your sleep.