Vitamin B6

Best for

Ease premenstrual mood crashes

Likely strong benefit · 50–100 mg/day · 1 meta-analysis , n=541

26 papers · 5 claims · 65 outcomes scored · 5 positive

Outcomes

What vitamin b6 actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Outcome Effect size Evidence Dose Weeks Rank

Ease premenstrual mood crashes Likely strong benefit

Steadies the emotional swings that hit in the days before your period.

1 meta-analysis n=541 50–100 mg — #1/5

10334745

large

1 meta-analysis n=541 Meta-analyzed

50–100 mg

—

#1 /5

Ease behavior changes before periods Likely strong benefit

Reduces irritability, emotional reactivity, and restlessness before your period.

1 meta-analysis n=— 50–600 mg — #2/9

10778376

large

1 meta-analysis n=— Meta-analyzed

50–600 mg

—

#2 /9

Ease premenstrual disruption Likely strong benefit

Premenstrual symptoms interfere less with daily activities and relationships.

1 meta-analysis n=— 50–600 mg — #2/9

10778376

large

1 meta-analysis n=— Meta-analyzed

50–600 mg

—

#2 /9

Ease premenstrual symptoms Likely strong benefit

Less cramping, bloating, mood dips, and disruption before your period.

1 meta-analysis n=— 50–600 mg — #3/9

10778376

large

1 meta-analysis n=— Meta-analyzed

50–600 mg

—

#3 /9

Ease depression symptoms Not enough research

Lowers the weight of sadness, low energy, and emotional numbness over weeks.

3 RCTs n=154 25–100 mg 5–9 wk

35831850·35851507·25163030

trivial

3 RCTs n=154

25–100 mg

5–9 wk

—

Outcome	Effect	Evidence	Dose	Weeks	Rank
Ease premenstrual mood crashes Likely strong benefit	large	1 meta-analysis n=541 Meta-analyzed	50–100 mg	—	#1/5
Ease behavior changes before periods Likely strong benefit	large	1 meta-analysis n=— Meta-analyzed	50–600 mg	—	#2/9
Ease premenstrual disruption Likely strong benefit	large	1 meta-analysis n=— Meta-analyzed	50–600 mg	—	#2/9
Ease premenstrual symptoms Likely strong benefit	large	1 meta-analysis n=— Meta-analyzed	50–600 mg	—	#3/9
Ease depression symptoms Not enough research	trivial	3 RCTs n=154	25–100 mg	5–9 wk	—

Buy well

Recommended Vitamin B6 products

Real products that dose Vitamin B6 where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Vitamin B6 dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

Risk profile

Adverse events and known drug interactions

Safety events

seizure severe

peripheral neuropathy moderate

gastrointestinal discomfort (poor digestion / abdominal bloating) moderate

dizziness mild

nausea mild

headache mild

diarrhea / increased stool frequency mild

stomach pain / abdominal cramps mild

Drug interactions

5-Fluorouracil major increases effect

Folinic Acid (Leucovorin) major increases effect

Cisplatin major decreases effect

Oxaliplatin major decreases effect

Isoniazid major decreases effect

Drug:Cycloserine major unknown

Isoniazid major decreases effect

Carbamazepine moderate decreases concentration

Diclofenac moderate increases effect

Carboplatin moderate decreases effect

Co-studied with

Supplements that share evidence with vitamin b6

Sources

Generated August 14, 2026

Vitamin B6

What vitamin b6 actually does, by outcome

Recommended Vitamin B6 products

Adverse events and known drug interactions

Supplements that share evidence with vitamin b6

More evidence for Vitamin B6

The Two-Edged Key: How Vitamin B6 Powers Calm, Builds Signals—and, in Excess, Numbs the Nerves

Best Supplements for Depression, Ranked by Clinical Evidence

Chastetree / Vitex agnus-castus

Vitamin B6

Recommended Vitamin B6 products

More evidence for Vitamin B6

NewThe Two-Edged Key: How Vitamin B6 Powers Calm, Builds Signals—and, in Excess, Numbs the Nerves

NewBest Supplements for Depression, Ranked by Clinical Evidence

NewChastetree / Vitex agnus-castus

The Two-Edged Key: How Vitamin B6 Powers Calm, Builds Signals—and, in Excess, Numbs the Nerves

Best Supplements for Depression, Ranked by Clinical Evidence

Chastetree / Vitex agnus-castus