How to increase serotonin naturally: research points to bright light, such as outdoor daylight, and regular physical activity as two non-drug ways to support serotonin. Steady sleep and balanced meals support overall wellbeing too, but food alone does not reliably raise brain serotonin. None of them replaces professional care if your mood has been low for two weeks or more. But light and movement are free, safe for most people, and appear to act on the same system that mood supplements aim at. Here is what serotonin is, what the research says about each habit, and where a supplement like 5-HTP fits.
Key takeaways
- Research points to bright light, such as outdoor daylight, and regular physical activity as two non-drug ways to support serotonin.
- Gut-made serotonin stays out of the brain; the brain builds its own supply from tryptophan.
- Eating turkey or another protein-rich food does not reliably raise brain serotonin, because tryptophan competes with other amino acids to enter the brain.
- If your mood has been low for two weeks or more, please talk to a healthcare professional rather than relying on habits or supplements alone.
What is serotonin, and what does it do?
Serotonin is a chemical messenger. In the brain it is involved in mood, calm, appetite and the sleep-wake cycle; at night your body converts some of it into melatonin. Most of your body's serotonin is actually made in the gut, where it helps regulate digestion. Serotonin made in your gut does not cross into the brain; the brain makes its own from tryptophan.
That chain is the key to everything below: tryptophan from food becomes 5-HTP, 5-HTP becomes serotonin, and serotonin later becomes melatonin. Vitamin B6 is one of the helpers in that process.
How to increase serotonin naturally: five habits and what each one does
| Habit | Why it may help | An easy way to start |
|---|---|---|
| Bright light | Research links brighter light exposure with higher serotonin activity | A daily walk outside in daylight |
| Movement | Aerobic exercise appears to raise serotonin activity and supports mood | Brisk walking, cycling or swimming most days |
| Balanced meals | Food supplies tryptophan, the raw material, though tryptophan-rich meals do not reliably raise brain serotonin | Include eggs, dairy, fish, tofu or seeds in regular meals |
| Steady sleep | Melatonin, made from serotonin, follows your body clock, which takes its cues from light | Same wake time every day, even weekends |
| Connection and enjoyable activity | Positive experiences support mood, though direct serotonin research is limited | A call with a friend, time outdoors, a hobby |
Light
In a 2007 editorial, McGill University psychiatry researcher Simon Young named bright light as one of four non-drug approaches worth studying for raising brain serotonin, while noting that the evidence tying light's mood benefits to serotonin is indirect. Even on a cloudy day, outdoor light can be far brighter than normal indoor lighting. Light also cues your body clock, which controls the evening rise in melatonin.
Exercise
Regular aerobic activity is consistently linked with better mood, and animal and human research suggests it increases serotonin activity in the brain. Citing a review of exercise and mood, Young notes the most consistent mood effect is seen when people who already exercise regularly do aerobic exercise at a level they are used to.
Food
Eating turkey or another protein-rich food does not reliably raise brain serotonin, because tryptophan competes with other amino acids to enter the brain, and a protein meal raises those other amino acids too. Food still supplies the raw material; good tryptophan sources include eggs, dairy, poultry, fish, tofu, pumpkin seeds and oats.
Sleep
Melatonin is made from serotonin. According to the NIH's National Institute of General Medical Sciences, your body's master clock raises melatonin in the evening based on how much light your eyes receive, and food intake also affects your daily rhythms. Regular sleep times, dimmer evenings and regular mealtimes keep those cues consistent. A wind-down routine helps; ours is in The Wind-Down Ritual.
Where does 5-HTP fit?
5-HTP is the step between tryptophan and serotonin. 5-HTP+ provides 200 mg of 5-HTP from Griffonia simplicifolia seed in a two-capsule serving, taken once a day 20 to 30 minutes before a meal, with the actives shown on the label and no proprietary blend. It is third-party tested, every batch, for purity and potency, and manufactured in USA with globally sourced materials in an NSF-certified, GMP-certified, FDA-registered facility. See Our Standards.
Because 5-HTP raises serotonin, do not combine it with antidepressants or other serotonin-affecting medication unless your healthcare provider approves, and do not use it with other products that contain 5-HTP, such as Deep Calm+™. A 2006 review of 5-HTP by Turner and colleagues names serotonin syndrome as one of the main safety issues it covers. Do not take 5-HTP+ together with Deep Calm+, Restful Night+™ or Night Balance+™: all three also contain 5-HTP (Night Balance+ in its Mood and Sleep Blend). Deep Calm+ contains St. John's Wort, 5-HTP and ashwagandha, so check with a doctor or pharmacist first if you take any prescription medication (especially antidepressants), and do not combine it with 5-HTP+ or Ashwagandha+. The National Institute of Mental Health notes that St. John's wort can come with risks, "including, in some cases, interactions with prescription medications." Deep Calm+ also provides 8 mg of vitamin B6 per serving. The NIH Office of Dietary Supplements notes that some research indicates pyridoxine (vitamin B6) at 200 mg a day can reduce blood levels of the seizure medicines phenytoin and phenobarbital, and that whether lower doses have any effect is not known; if you take a seizure medicine, ask your doctor before using Deep Calm+. The 5-HTP+ label also says: do not exceed recommended dose; pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this or any dietary supplement. Keep out of reach of children. Do not use if safety seal is damaged or missing. Store in a cool, dry place. Read 5-HTP Side Effects: What to Know Before You Start 5-HTP+ before you begin.
Signs it is time to talk to a professional
According to the National Institute of Mental Health, major depression includes symptoms of depressed mood or loss of interest, most of the time for at least two weeks, that interfere with daily activities. If your mood has been low for two weeks or more, please talk to a healthcare professional rather than relying on habits or supplements alone. The same goes if you have lost interest in things you usually enjoy, your sleep or appetite has changed sharply, or daily life feels hard to manage. If you ever have thoughts of harming yourself, call or text 988 in the United States to reach the Suicide and Crisis Lifeline, any time.
Frequently asked questions about increasing serotonin naturally
What foods increase serotonin?
No food delivers serotonin to the brain directly. Foods that provide tryptophan, such as eggs, dairy, poultry, fish, tofu and seeds, supply the raw material, but research shows eating them does not reliably raise brain serotonin, because other amino acids from the same meal compete for entry.
Does sunlight increase serotonin?
Research links brighter light exposure with higher serotonin activity, and daylight is much brighter than indoor light. A daily walk outside in daylight is a simple habit to try.
How long does it take to raise serotonin naturally?
There is no home test for brain serotonin, so think in terms of how you feel. Research has not set a timeline for these habits; if your mood stays low for two weeks or more, talk to a healthcare professional.
Is 5-HTP better than tryptophan?
5-HTP is one step closer to serotonin in the body's chain. Both carry interaction cautions with serotonin-affecting medication; a 2006 review of 5-HTP by Turner and colleagues names serotonin syndrome as one of 5-HTP's main safety issues. Ask your healthcare provider which, if either, suits you.
Can you have too much serotonin?
Yes. Combining several serotonin-raising medicines or supplements can cause a serious reaction called serotonin syndrome; a 2006 review of 5-HTP by Turner and colleagues names it as one of 5-HTP's main safety issues. That is why you should never stack 5-HTP products, and should not combine 5-HTP with antidepressants without your provider's approval.
Related reading from our Wellness Hub
- 5-HTP: Meet 5-HTP+ for Healthy Mood Balance
- Small Gratitude, Big Shift: A Two-Minute Gratitude Practice
- Do B Vitamins Help With Stress? What the Research Says
Sources
- Young SN. How to increase serotonin in the human brain without drugs. J Psychiatry Neurosci, 2007
- Turner EH, Loftis JM, Blackwell AD. Serotonin a la carte: supplementation with the serotonin precursor 5-hydroxytryptophan. Pharmacology & Therapeutics, 2006.
- NIH Office of Dietary Supplements: Vitamin B6 Fact Sheet (updated June 16, 2023)
- NIH National Institute of General Medical Sciences: Circadian Rhythms (updated May 20, 2025)
- National Institute of Mental Health: Depression (NIH Publication No. 24-MH-8079, revised 2024)
Individual results vary.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
