Does vitamin B6 help with sleep?

Not in the trials that tested it. The most direct one gave healthy Korean adults 100 mg of vitamin B6 an hour before bed for 4 weeks, and sleep duration and sleep quality scores did not change in the 14 people who finished the B6-only arm. We found no meta-analysis of vitamin B6 alone and sleep. The doses tested, 40 mg in one trial and 100 to 250 mg in the rest, sit far above the 12 mg a day upper limit that EFSA set for adults in 2023.

Myth. The idea that vitamin B6 on its own improves sleep is not backed by the trials that tested it. Besides the 4-week trial above, a small sleep-lab study gave 12 healthy men 100 mg of pyridoxine in the evening. Melatonin, body temperature and sleep came out the same as on placebo.

Unsettled. Restless legs syndrome is the one place where a review found B6 helping sleep. A 2024 systematic review of 10 randomized trials in 482 people with the condition found B6 and magnesium oxide improved sleep quality and symptoms. That B6 finding rests on a single single-blind trial, and the review rated half of its trials at high risk of bias.

What the trials found

In healthy adults, nothing on sleep

The Korean crossover trial is the best direct test. Adults aged 20 to 65 with no chronic disease took 100 mg of B6 nightly for 4 weeks, with a 4-week washout. The authors report no significant findings for sleep variables, blood serotonin or caffeine intake in the B6-only group. The arm was small, at 14 completers, and the people in it were healthy sleepers. The older sleep-lab study of 12 men, measured by polysomnography, came to the same place. It did not state that it was randomized.

The same Korean trial had a third arm that combined 100 mg of B6 with 600 mg of gamma-PGA. Against placebo, the authors report total sleep up by 0.27 hours (SD 0.98) and the PSQI sleep quality score down by 0.52 points (SD 1.58) in 17 completers. That effect belongs to the combination. Its size is small and its clinical value uncertain.

Dreams, yes, in the narrow sense

In a randomized double-blind trial of 100 Australian adults, 240 mg of B6 before bed for 5 nights raised the amount of dream content people recalled. It did not change how vivid, bizarre or colored the dreams were, and it did not change any other sleep measure. An earlier pilot in 12 college students had found that 250 mg raised a combined dream vividness score over placebo while 100 mg did not. The authors called that preliminary, and the larger trial did not confirm the vividness part. Remembering more of your dreams is a different thing from sleeping better.

Restless legs

The single trial behind the review randomized 75 people with restless legs syndrome to 40 mg of B6, 250 mg of magnesium oxide or placebo for 2 months. At 1 month the groups did not differ. At 2 months sleep quality and severity differed significantly across the three groups (P = 0.001). That three-way P value does not separate B6 from magnesium, the trial was single-blind, and the abstract gives no size for the benefit. The review itself says magnesium did better.

Combinations in children

In a randomized pilot of 34 children with chronic headache, adding tryptophan and vitamin B6 to melatonin for 2 months cut night awakenings from 7.4 to 3.3 a month. Melatonin alone went from 3.6 to 2.7, which did not reach significance. There was no placebo, the two groups started from different baselines, and the effect of B6 cannot be told apart from the tryptophan.

Surveys

In US adults surveyed in NHANES between 2005 and 2010, people in the middle two quarters of blood levels of active vitamin B6 had lower odds of daytime sleepiness than those in the lowest quarter, and the authors found the link only in men. In a second NHANES analysis of 24,234 adults, more B6 from food went with slightly lower odds of sleep problems, as did several other vitamins. Both are snapshots in which diet quality moves many vitamins together, so neither says that a B6 tablet would change anyone's sleep.

Who should be careful

Dose is the real caution here. In 2023 EFSA set an upper limit of 12 mg a day of vitamin B6 for all adults, pregnant and breastfeeding women included, based on reviews of B6 and peripheral nerve damage. For infants and children its limits are lower, from 2.2 to 10.7 mg a day depending on age. The US limit for adults is 100 mg a day. The sleep and dream trials in healthy adults used 100 to 250 mg, at or above the US limit and many times over the EU one. The restless legs trial used 40 mg, more than three times the EU limit.

Not for everyone. A 4-week trial at 100 mg nightly reported no side effects in any of its 47 completers, and four weeks is far too short to show the nerve damage linked to long-term high doses. In the Australian trial, an exploratory B complex arm taken before bed for 5 nights left people rating their sleep worse and feeling more tired on waking. If you already take a B complex or a high-dose B6 product and sleep badly, that is worth knowing.

What expert bodies say

The EU lets vitamin B6 labels say that it contributes to the reduction of tiredness and fatigue. That claim is about daytime energy when intake is adequate, and the EU register holds no authorized sleep claim for vitamin B6. The upper limits above come from EFSA, as reported by the NIH Office of Dietary Supplements. We did not find an expert body that recommends vitamin B6 for sleep.

How we searched

What would change this answer

• A randomized trial of vitamin B6 alone in people with insomnia. We found none published and none registered. Every trial on this page recruited healthy adults, children with headache or people with restless legs.
• A trial at a dose inside the upper limits. All the sleep work so far used doses above the EU limit, and most of it doses at or above the US one.
• A double-blind restless legs trial that compares B6 with placebo directly and reports the size of the change in sleep quality.

More on the vitamin itself: vitamin B6, can you get too much vitamin B6, and the evidence on magnesium and sleep.

Sources

1. ev-b6sl-01 · Meta-analysis or systematic review · systematic review of randomized clinical trials, no meta-analysis · n = 10 RCTs, 482 participants
   Magnesium oxide and vitamin B6 significantly improved sleep quality and RLS symptoms, with magnesium showing greater effectiveness.
   
   Who: patients with restless legs syndrome in randomized clinical trials of dietary supplements
   Effect: vitamin B6 and magnesium oxide significantly improved sleep quality and RLS symptoms; no pooled effect size
   Certainty: The B6 finding rests on one single-blind trial (36587225); only synthesis that touches B6 and sleep at all; restless legs only.
   Nutrients, 2024 · checked 2026-10-07 · we read the abstract
2. ev-b6sl-02 · Meta-analysis or systematic review · systematic review of randomized clinical trials · n = 10 RCTs, 482 participants
   Despite these encouraging results, a high risk of bias was noted in half of the studies, emphasizing the need for more rigorous research.
   
   Who: patients with restless legs syndrome in randomized clinical trials of dietary supplements
   Effect: high risk of bias in half of included trials
   Certainty: Limits what the B6 signal in RLS can carry.
   Nutrients, 2024 · checked 2026-10-07 · we read the abstract
3. ev-b6sl-03 · Randomized controlled trial(s) · single-blind randomized placebo-controlled trial, 40 mg/day vitamin B6 or 250 mg/day magnesium oxide for 2 months · n = 75 (three groups)
   In the second month following the intervention, the mean and standard deviation of sleep quality and disease severity were significantly different (P = 0.001).
   
   Who: patients with restless legs syndrome for at least three months, randomized to magnesium, vitamin B6 or placebo
   Effect: no between-group difference at 1 month; significant difference in sleep quality and severity at 2 months (P = 0.001); mean differences not given in abstract
   Certainty: Single-blind, three-arm P value does not separate B6 from magnesium; size of benefit not reported in abstract.
   BMC Complement Med Ther, 2022 · checked 2026-10-07 · we read the abstract
4. ev-b6sl-04 · Randomized controlled trial(s) · randomized double-blind placebo-controlled trial, 240 mg pyridoxine hydrochloride before bed for 5 nights, with an exploratory B complex arm · n = 100
   We found that vitamin B6 significantly increased the amount of dream content participants recalled but did not significantly affect dream vividness, bizarreness, or color, nor did it significantly affect other sleep-related variables.
   
   Who: 100 participants from across Australia
   Effect: more dream content recalled; no significant effect on dream vividness, bizarreness, color or other sleep-related variables
   Certainty: Very short; dose 20 times the EU upper limit; outcome is dream recall, not sleep quality.
   Percept Mot Skills, 2018 · checked 2026-10-07 · we read the abstract
5. ev-b6sl-05 · Randomized controlled trial(s) · exploratory arm of a randomized double-blind placebo-controlled trial · n = 100 (all arms)
   In contrast, participants in the B complex group showed significantly lower self-rated sleep quality and significantly higher tiredness on waking.
   
   Who: 100 participants from across Australia, exploratory B complex arm
   Effect: significantly lower self-rated sleep quality and higher tiredness on waking with B complex
   Certainty: Exploratory arm, small, 5 nights; content of the B complex not given in abstract.
   Percept Mot Skills, 2018 · checked 2026-10-07 · we read the abstract
6. ev-b6sl-06 · Randomized controlled trial(s) · randomized double-blind placebo-controlled crossover trial, 100 mg/day vitamin B6 1 h before bed for 4 weeks, 4-week washout · n = 14 completers in the B6-only group (47 completers overall)
   There were no significant findings for sleep status variables, serum serotonin levels, and caffeine intake in groups A and B.
   
   Who: healthy adults aged 20 to 65 with no chronic disease; group B received vitamin B6 only
   Effect: no significant findings for sleep status variables, serum serotonin or caffeine intake in the B6-only group
   Certainty: Small arm; healthy sleepers; best direct test of B6 alone on sleep and it was null.
   Nutrition Research and Practice, 2021 (poly-gamma-glutamic acid and vitamin B6 supplements on sleep status: randomized intervention study) · checked 2026-10-07 · we read the fulltext
7. ev-b6sl-07 · Randomized controlled trial(s) · randomized double-blind placebo-controlled crossover trial, 4 weeks per period · n = 17 completers in the combination group
   When compared with the placebo, the intervention showed an increase in the total sleep duration (mean ± SD, 0.27 ± 0.98 h) and a decrease in PSQI global scores (−0.52 ± 1.58).
   
   Who: healthy adults aged 20 to 65; group C received 600 mg gamma-PGA plus 100 mg vitamin B6
   Effect: sleep duration +0.27 +/- 0.98 h vs placebo -0.25 +/- 1.25 h; PSQI -0.52 +/- 1.58 vs +0.64 +/- 1.93 (P < 0.05)
   Certainty: Effect belongs to a combination, not B6 alone; small and of uncertain clinical value.
   Nutrition Research and Practice, 2021 (poly-gamma-glutamic acid and vitamin B6 supplements on sleep status: randomized intervention study) · checked 2026-10-07 · we read the fulltext
8. ev-b6sl-08 · Randomized controlled trial(s) · randomized double-blind placebo-controlled crossover trial · n = 47 completers
   All participants reported no side effects in any group after supplementation.
   
   Who: healthy adults aged 20 to 65
   Effect: no side effects reported in any group
   Certainty: Four weeks is too short for the nerve damage linked to long-term high doses (see ODS card).
   Nutrition Research and Practice, 2021 (poly-gamma-glutamic acid and vitamin B6 supplements on sleep status: randomized intervention study) · checked 2026-10-07 · we read the fulltext
9. ev-b6sl-09 · Observational data · placebo-controlled clinical trial with polysomnography, 100 mg at 17:00 · n = 12
   In adult man, the oral administration of 100 mg-pyridoxine during the evening hours has no effect on melatonin secretion nor does it alter CBT or sleep quality.
   
   Who: twelve healthy men
   Effect: melatonin onset, peak, mean and AUC similar to placebo; sleep amount and architecture similar
   Certainty: Randomization not stated; tiny; one dose. Contradicts the melatonin pathway usually cited for B6 and sleep.
   Neuro Endocrinol Lett, 2002 · checked 2026-10-07 · we read the abstract
10. ev-b6sl-10 · Observational data · placebo-controlled double-blind counterbalanced crossover, 100 mg, 250 mg or placebo for 5 nights · n = 12
    Morning self-reports indicated a significant difference in dream-salience scores (this is a composite score containing measures on vividness, bizarreness, emotionality, and color) between the 250-mg condition and placebo over the first three days of each treatment.
    
    Who: 12 college students, all three conditions in counterbalanced order
    Effect: dream-salience score higher with 250 mg vs placebo over the first three days
    Certainty: Authors call it preliminary; the larger replication (29665762) did not confirm vividness.
    Percept Mot Skills, 2002 · checked 2026-10-07 · we read the abstract
11. ev-b6sl-11 · Observational data · cross-sectional study · n = —
    Compared with the first quartile (Q1), the odds ratios (ORs) and 95% confidence intervals (CIs) of daytime sleepiness for the Q2 and Q3 of serum PLP concentrations were 0.76 (0.59-0.99) and 0.78 (0.62-0.98), respectively.
    
    Who: US adults, NHANES 2005-2010, serum PLP by HPLC, self-reported sleep
    Effect: daytime sleepiness OR 0.76 (95% CI 0.59 to 0.99) Q2 and 0.78 (0.62 to 0.98) Q3 vs Q1; significant only in males
    Certainty: Cross-sectional, self-reported sleep; association is non-linear; not evidence that supplements help.
    Nutrients, 2022 · checked 2026-10-07 · we read the abstract
12. ev-b6sl-12 · Observational data · cross-sectional analysis of dietary intake · n = 24,234 (sleep analysis)
    The inversely associations of sleeping problem with niacin (OR: 0.902, 95% CI: 0.826-0.985), folic acid (0.882, 0.811-0.959), vitamin B6 (0.892, 0.818-0.973), vitamin C (0.908, 0.835-0.987), vitamin E (0.885, 0.813-0.963) and lycopene (0.919, 0.845-0.998) were also observed.
    
    Who: US general population, NHANES
    Effect: sleep problem OR 0.892 (95% CI 0.818 to 0.973) for vitamin B6 intake; similar for niacin, folate, vitamins C and E
    Certainty: Many vitamins move together with diet quality; no specificity to B6.
    Environ Sci Pollut Res Int, 2023 · checked 2026-10-07 · we read the abstract
13. ev-b6sl-13 · Randomized controlled trial(s) · randomized pilot trial, two active arms, no placebo, 2 months · n = 34
    The addition of tryptophan and vitamin B6 appears to have stronger influence on night awakenings reduction than melatonin only.
    
    Who: children with primary chronic headache, with or without sleep disorders
    Effect: night awakenings: melatonin+tryptophan+B6 7.4 to 3.3 (P = 0.041); melatonin only 3.6 to 2.7 (P = 0.495)
    Certainty: Within-group changes, unequal baselines, no placebo; B6 effect cannot be separated from tryptophan.
    Minerva Pediatr, 2020 · checked 2026-10-07 · we read the abstract
14. ev-b6sl-14 · Position of an expert body · agency fact sheet · n = —
    Based on systematic reviews that examined associations between vitamin B6 and peripheral neuropathy, the panel set an upper limit for vitamin B6 of 12 mg/day for all adults, including women who are pregnant or lactating, with lower amounts ranging from 2.2 to 10.7 mg/day for infants and children, depending on age.
    
    Who: adults including pregnant and lactating women (EU)
    Effect: EU UL 12 mg/day (US UL 100 mg/day); critical effect peripheral neuropathy
    Certainty: Bodies differ by about eight-fold (EU 12 vs US 100 mg/day); sleep trial doses sit at or above the US limit.
    NIH Office of Dietary Supplements, Vitamin B6 Fact Sheet for Health Professionals · checked 2026-10-07 · we read the section
15. ev-b6sl-15 · Position of an expert body · regulatory register entry · n = —
    POL-HC-6498 Vitamin B6 Vitamin B6 contributes to the reduction of tiredness and fatigue Authorised
    
    Who: EU food and supplement labeling
    Effect: authorized health claim on tiredness and fatigue; no authorized sleep claim for vitamin B6
    Certainty: Claim rests on adequate intake correcting deficiency, not on high-dose use.
    EU Register on nutrition and health claims, claim POL-HC-6498, snapshot 2026-09-21 · checked 2026-10-07 · we read the section