How to Boost Serotonin Naturally: What Research Shows

The best-supported natural ways to boost serotonin are getting bright daylight, exercising regularly and doing things that lift your mood, while food has a smaller effect than most people think. Serotonin is a chemical messenger that helps regulate mood, sleep and digestion, and studies of brain serotonin need specialized lab methods, not a home test. This guide explains what serotonin does, natural ways to increase serotonin, which foods and supplements have human research behind them, whether an instant serotonin boost exists, and the safety rules that matter most, especially if you take an antidepressant.

It is educational, not medical advice.

Key Takeaways

Daylight matters: in 101 healthy men, the brain made serotonin fastest on days with more bright sunlight and turned it over most slowly in winter (Lambert et al., 2002).
Light, exercise, mood and diet are the four drug-free strategies a widely cited review proposed for raising brain serotonin (Young, 2007).
Turkey will not do it: eating protein does not raise brain tryptophan, because other amino acids compete with it to enter the brain (Young, 2007).
Safety first: supplements that act on serotonin, including kanna, 5-HTP, tryptophan and St. John's wort, should not be combined with antidepressants or other serotonin medicines without a doctor (Cleveland Clinic).

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Diagram: how to boost serotonin. Brain serotonin rose with hours of bright sunlight; exercise and good moods raise it; protein supplies tryptophan; do not mix serotonin supplements such as kanna with antidepressants.

What Is Serotonin?

Serotonin (5-hydroxytryptamine, or 5-HT) is a chemical messenger made from the amino acid tryptophan. It plays a role in mood, sleep, digestion, nausea, bone health and blood clotting. About 90% of the body's serotonin is in the cells lining the gut, and only about 10% is made in the brain (Cleveland Clinic).

Gut bacteria help control how much serotonin the gut makes, and gut serotonin acts mainly on digestion and blood platelets (Yano et al., 2015). For how serotonin compares with the motivation chemical dopamine, see dopamine vs serotonin.

Natural Ways to Increase Serotonin

1. Get bright light, ideally outdoors

In a study that sampled blood leaving the brain in 101 healthy men, serotonin production was directly related to how many hours of bright sunlight there were that day and rose quickly with brighter light, and serotonin turnover was lowest in winter (Lambert et al., 2002). Even on a cloudy day, outdoor light can be greater than 1,000 lux, a level never normally reached indoors (Young, 2007). A morning walk outside is an easy habit; our science-based morning routine builds it in.

2. Exercise regularly

Exercise is one of the four strategies the review proposed for raising brain serotonin: physical activity increases the firing of serotonin nerve cells, which raises serotonin release and production, and the most consistent effect was seen when regular exercisers did aerobic exercise at a level they were used to (Young, 2007). Brisk walking, cycling or swimming at a comfortable, familiar pace all fit.

3. Do things that lift your mood

The link appears to run both ways. In a brain imaging study described in the same review, healthy people who felt happier during a positive mood exercise showed higher serotonin synthesis in a brain area involved in emotion, and sadness showed the opposite pattern (Young, 2007). Time with people you like, hobbies, music and techniques from our guide on how to calm down all count.

4. Eat a balanced diet, with realistic expectations

Your body needs tryptophan from food to make serotonin, so a diet with enough protein matters. But the idea that a high-protein food such as turkey raises brain serotonin is false: after a protein meal, other amino acids rise too and compete with tryptophan to cross into the brain (Young, 2007). Eat a balanced diet for overall health rather than chasing single serotonin foods.

5. Consider massage

A review of massage therapy studies reported that, in studies that measured them in urine, serotonin levels rose by an average of 28% and the stress hormone cortisol fell by an average of 31% after massage (Field et al., 2005). Urine levels mainly reflect serotonin outside the brain, so read this as a sign of relaxation rather than proof of a brain change.

6. Look after your gut

Because gut bacteria influence how much serotonin the gut makes (Yano et al., 2015), a fiber-rich diet with vegetables, legumes and whole grains supports the gut side of the serotonin system. This mainly affects digestion, not brain serotonin.

To see how the gut and brain signal each other beyond serotonin, read our guide to the gut-brain axis.

Is There an Instant Serotonin Boost?

Not in a way anyone can measure at home. The quickest natural steps with research behind them are stepping into bright daylight, moving your body and doing something that genuinely lifts your mood (Young, 2007, Lambert et al., 2002). Be wary of products sold as an instant serotonin boost, and never stack several serotonin supplements together for a faster effect, since that raises the risk of serotonin-related side effects (Cleveland Clinic).

Foods That Support Serotonin

These foods support the serotonin system indirectly, by supplying tryptophan or feeding the gut:

Food group	Examples	Why it helps
Protein foods	Eggs, poultry, fish, dairy, tofu, beans	Supply tryptophan, the building block of serotonin
Whole grains and starchy foods	Oats, brown rice, potatoes	Part of a balanced diet that keeps meals regular
Fiber-rich plants	Vegetables, legumes, fruit	Feed the gut bacteria that help regulate gut serotonin

Serotonin Supplements: What Research Shows

Supplements that act on serotonin can interact with medicines, so read the safety section below before trying any of them.

5-HTP and tryptophan: both are precursors your body can turn into serotonin. A Cochrane review found that, of many trials for low mood in people diagnosed with depression, only two small trials (64 people) were of good enough quality to include; they favored 5-HTP or tryptophan over placebo, but the reviewers judged the evidence too limited to be conclusive (Shaw et al., 2002).
Kanna (Sceletium tortuosum): a South African plant whose standardized extract has been described as a serotonin reuptake inhibitor and PDE4 inhibitor. In a placebo-controlled brain imaging study in 16 healthy adults, a single 25 mg dose reduced the response of the amygdala, a brain area that reacts to threat, to fearful faces (Terburg et al., 2013). Because it acts on serotonin reuptake, kanna is not for anyone taking antidepressants or other medicines that affect serotonin. Learn more on our kanna ingredient page, in what is kanna and in kanna side effects and safety.
Saffron: a spice extract studied for mood. A meta-analysis of five small randomized trials in people with low mood found saffron improved mood scores compared with placebo (Hausenblas et al., 2013). Read more in saffron supplement benefits.
St. John's wort: an herb that interacts in dangerous, sometimes life-threatening ways with many medicines, and taking it with antidepressants or other serotonin medicines may lead to serious serotonin-related side effects (NCCIH).

For a wider look at mood and stress ingredients, see best supplements for stress and mood, our stress, mood and nervous system balance hub, and the companion guide on how to increase dopamine naturally. If you want saffron in a daily capsule, see our Saffron Mood and Calm Capsules. For support through the endocannabinoid system instead, our Anandamide Supplement combines anandamide, PEA, OEA and L-theanine to support a steady mood and calm. If you are looking at 5-HTP for sleep, our guide to 5-HTP vs melatonin compares how the two are studied.

Safety: Serotonin Supplements and Antidepressants

Do not combine kanna, 5-HTP, tryptophan or St. John's wort with antidepressants (SSRIs, SNRIs, MAOIs or others) or other medicines that raise serotonin unless your doctor approves. Combining substances that raise serotonin can cause serotonin syndrome. Medicines and substances that can contribute include antidepressants, some opioid pain medicines, cough medicines with dextromethorphan, triptans, lithium, linezolid, some anti-nausea medicines, St. John's wort, ginseng and tryptophan (Cleveland Clinic).

Mild to moderate symptoms include nervousness, nausea, diarrhea, shakiness, agitation, muscle twitching, sweating and dilated pupils. Severe symptoms include confusion, a rapid or abnormal heartbeat, high fever and seizures, and need emergency care (Cleveland Clinic). Our Mood Stack contains kanna and lithium orotate, so it is not for anyone taking antidepressants or other serotonin medicines. Talk to a healthcare provider before using any of these if you are pregnant, breastfeeding or take medication.

When to Talk to a Doctor

If you have felt low, flat or hopeless for more than two weeks, or low mood is affecting your sleep, work or relationships, talk to a doctor. Do not stop or change a prescribed antidepressant on your own. If you have thoughts of harming yourself, call or text 988 (the Suicide and Crisis Lifeline in the US) or your local emergency number straight away.

Frequently Asked Questions

How can I boost serotonin naturally?

Get bright daylight, exercise regularly, do things that lift your mood and eat a balanced diet. These are the drug-free strategies a widely cited review proposed for raising brain serotonin (Young, 2007).

Is there an instant serotonin boost?

No supplement or food gives a measurable instant boost. Stepping outside into bright light and moving your body are the quickest natural steps with research behind them (Lambert et al., 2002, Young, 2007).

Do serotonin supplements work?

5-HTP and tryptophan have been studied in small, older trials in people with low mood (Shaw et al., 2002). Kanna has human brain imaging research (Terburg et al., 2013), and saffron has small mood trials (Hausenblas et al., 2013). None should be taken with antidepressants without a doctor's advice.

What foods increase serotonin?

Protein foods supply tryptophan, and fiber-rich plants feed the gut bacteria that regulate gut serotonin (Yano et al., 2015). But no single food, including turkey, measurably raises brain serotonin (Young, 2007).

Can I take kanna with an antidepressant?

No. Kanna has been described as a serotonin reuptake inhibitor (Terburg et al., 2013), so combining it with antidepressants or other serotonin medicines could raise the risk of serotonin syndrome (Cleveland Clinic). Talk to your doctor first.

Where is most serotonin made?

About 90% is in the cells lining the gut and only about 10% is made in the brain (Cleveland Clinic).

Does sunlight increase serotonin?

Yes. Brain serotonin production rose with the hours of bright sunlight in a study of 101 healthy men (Lambert et al., 2002).

Can you test your serotonin levels?

Not at home. Research on brain serotonin uses specialized methods, such as sampling blood as it leaves the brain (Lambert et al., 2002) or brain imaging (Young, 2007). If you are worried about your mood, a conversation with a doctor is more useful than chasing a number.