Vitamin B6 Benefits: What Science Says and Who Needs It

Vitamin B6 — the collective name for pyridoxine, pyridoxal and pyridoxamine — is a B-complex vitamin that the body uses as a cofactor in many enzyme reactions, above all in amino acid and protein metabolism, in red blood cell formation and in the normal functioning of the nervous system. In Portugal, most people get enough B6 from food, because it is found in meat, fish, pulses, potatoes and fortified cereals.

When people ask "vitamin B6 benefits: what is it for?", the honest answer is this: the well-established benefits are those of the body's basic functions — energy and protein metabolism, red blood cell formation and the nervous system. For goals such as improving mood, reducing stress or boosting energy in people who are not deficient, the evidence is weak or non-existent. This article explains what is well supported, what is promising but conditional, and what is just marketing.

What does vitamin B6 do in the body?

B6 works as a kind of chemical helper: without it, several enzymes cannot turn the nutrients we eat into the molecules the body needs. Its core functions are:

• Protein and amino acid metabolism: it takes part in the transformation of amino acids and in the synthesis of new proteins.
• Red blood cell formation: it is needed to produce haemoglobin, the protein that carries oxygen in the blood.
• Nervous system: it is involved in the production of neurotransmitters such as serotonin and dopamine, and in the normal functioning of nerve cells.
• Glycogen metabolism: it helps the body mobilise the energy stores held in the liver and muscles.

These functions are reflected in the health claims authorised in the European Union: vitamin B6 contributes to normal protein and glycogen metabolism, to the normal functioning of the nervous system and to normal red blood cell formation ¹. These are regulated claims, which means they may appear on labels and information materials, but they go no further than this.

What the scientific evidence shows — and what it does not

There are areas where B6 has interesting studies, but almost always in specific contexts. It is important not to extrapolate those results into "take B6 for everything".

Nausea and vomiting in pregnancy

A meta-analysis of 13 randomised clinical trials, with 1,174 pregnant women, compared ginger with vitamin B6 and with placebo for the relief of nausea and vomiting in pregnancy; ginger showed a significant effect in improving general symptoms compared with placebo and vitamin B6 ². This does not mean that B6 is ineffective — it means that, in this set of studies, ginger was the intervention with a demonstrated effect. An earlier systematic review, which assessed vitamins B6, B12 and C in pregnancy, mentioned reduced nausea and vomiting and improved dental health as potential benefits of B6 supplementation, although the evidence is limited ³. In any case, nausea in pregnancy should be discussed with your doctor or obstetric team: never adjust supplements on your own during pregnancy.

Cyclical breast pain (mastalgia)

A 2025 systematic review and meta-analysis assessed the effect of vitamin B6 on the severity of mastalgia in healthy women, comparing it with placebo; the pooled analysis of the three included studies showed no significant effect ⁴. In other words, although B6 is often mentioned for this purpose, the current evidence does not support it as a treatment.

Cognitive function

A Cochrane review assessed the effect of vitamin B6 supplementation on cognition in older people who were healthy or had cognitive decline ⁵. B6 is needed by the brain, but that is not the same as saying that taking more improves memory.

Homocysteine and cardiovascular risk

B6 takes part in the metabolism of homocysteine, an amino acid whose raised levels are associated with higher cardiovascular risk. However, a meta-analysis of randomised trials with folic acid, with or without vitamin B6, found no significant reduction in the risk of coronary revascularisation with supplementation, although a beneficial effect was seen in trials using a moderate dose of vitamin B6 ⁶. This illustrates an important point: improving a laboratory marker does not guarantee improving the clinical outcome.

Pain and specific clinical situations

There are studies in populations with specific conditions, such as fibromyalgia, where a daily dose of 80 mg of vitamin B6 was compared with placebo ⁷, or in patients with type 1 bipolar disorder in a manic phase, also with 80 mg daily ⁸. These studies should not be used to recommend B6 to the general population: they were carried out in people who were ill, with doses far above nutritional needs, and the results are not generalisable. If you have a clinical condition, the decision about supplementation belongs to your doctor.

Who may really need a vitamin B6 supplement?

Vitamin B6 deficiency is rare in healthy adults eating a varied diet. The groups at higher risk of deficiency include people with conditions that affect intestinal absorption, heavy alcohol consumption, older people and those taking certain medicines, such as some antiepileptics. In these cases, the assessment should be made by a healthcare professional, who can arrange tests and recommend the appropriate dose.

If you are pregnant or breastfeeding, have a diagnosed condition or take regular medication, talk to your doctor before starting any supplement. Vitamin B6 is safe in the amounts usually found in food, but high, prolonged doses can cause neurological problems — so "more" is not "better".

If you are wondering whether B6 is suitable for a child, the article vitamin B6 for children: is it safe and necessary? explains what is known — but any decision about supplementing a child should be taken with the paediatrician.

One practical sign to watch for: very high, prolonged doses of vitamin B6 can cause neurological symptoms, such as tingling or numbness in the hands and feet. If you notice these symptoms, stop the supplement and speak to a healthcare professional. As a safety reference, EFSA has set a tolerable upper intake level of 12 mg per day for adults ⁹ — far above the amounts usually found in supplements, but well below the doses used in some clinical studies.

Study doses vs. label dose: a practical example

References to doses of 80 mg or more per day are common online. Those doses come from studies in specific populations, such as the trials in fibromyalgia ⁷ or in patients with type 1 bipolar disorder in a manic phase ⁸, and they are not instructions for the general population. For comparison, here is what some products in the TuttiBear range provide:

Product	Vitamin B6 per serving	% NRV
Hair & Nails Gummies (2 gummies)	2 mg	143%
Multivitamin Gummies (2 gummies)	2 mg	143%
Appetite Control Gummies (2 gummies)	1 mg	71%
Hormonal Balance Gummies (2 gummies)	1.5 mg	107%
Focus and Concentration Gummies (2 gummies)	1.4 mg	100%
Magnesium Gummies (2 gummies)	1.4 mg	100%
Energy Gummies with Guarana (2 gummies)	1.4 mg	100%
Kids' Multivitamin Gummies (from 2 years) (1 gummy)	1 mg	71%

As you can see, supplement doses are in the order of 1 to 2 mg per serving — far below the doses used in clinical studies in patients, and in line with daily nutritional needs. Remember: study doses are not instructions for use, and individual needs vary.

Vitamin B6 in gummies: what changes?

There are no studies directly comparing the effectiveness of gummies with that of vitamin B6 tablets. What is known is that B6 is a water-soluble vitamin, well absorbed from the gastrointestinal tract, and that the format (gummy, tablet, capsule) does not change the nature of the vitamin. The choice between formats is mainly a question of convenience and personal preference — for example, for people who find tablets hard to swallow. If you want to go deeper into this, see our article on vitamin B6 gummies vs tablets.

What matters on the label is the amount of B6 per serving, the number of gummies per serving and the warnings. For example, Hormonal Balance Gummies provide 1.5 mg of vitamin B6 per 2 gummies (107% NRV) and include other botanicals; Focus and Concentration Gummies provide 1.4 mg per 2 gummies (100% NRV). In any case, do not exceed the daily dose recommended on the label and keep supplements out of the reach of children, because gummies are sweet and can be eaten in excess.

Where popular claims overreach

Many promises about B6 circulate that have no scientific support for the general population:

• "It gives you energy": B6 takes part in energy metabolism, but it is not a stimulant. In people who are not deficient, taking more does not increase energy.
• "It improves mood and reduces stress": B6 is needed to produce serotonin, but studies on supplementation and mood are preliminary and inconsistent. There is not enough evidence to recommend B6 as a treatment for mood disorders.
• "It eases PMS": the evidence is insufficient and study results are not consistent.
• "It protects the heart": despite lowering homocysteine, supplementation did not translate into fewer coronary revascularisations in the trials ⁶.
• "It improves skin and hair": there is no solid evidence that B6, on its own, has this effect in people who are not deficient.

In the European Union, claims such as "reduces stress" or "improves sleep" are not among the authorised health claims for vitamin B6 ¹. Be wary of products that use them.

When to talk to a healthcare professional

You should consult a doctor, pharmacist or dietitian before taking B6 supplements if: you are pregnant or breastfeeding; you have a diagnosed condition (for example coeliac disease, inflammatory bowel disease or kidney disease); you take regular medication, especially antiepileptics; you have neurological symptoms such as tingling or numbness in the hands and feet; or you are thinking of giving a supplement to a child. In these cases, professional assessment is essential, because the dose and the need depend on the clinical context.

For a more detailed look at safety and high doses, see the article is vitamin B6 bad for you? What the science says and when to be careful. And if you want to understand better the role of this vitamin in the body, see how vitamin B6 works.

In summary

Vitamin B6 is essential for protein metabolism, red blood cell formation and the functioning of the nervous system. Most people get enough through food. Supplementation makes sense in situations of confirmed deficiency or increased risk, and should be guided by a healthcare professional. For vague goals such as "more energy" or "better mood", the evidence does not support widespread use. If you choose a supplement, check the label, respect the stated dose and remember that gummies are a convenient format, but they do not replace a varied and balanced diet.

Frequently asked questions

What is vitamin B6 for?

Vitamin B6 is needed for normal protein and glycogen metabolism, for normal red blood cell formation and for the normal functioning of the nervous system. It is also involved in the production of neurotransmitters. These are essential functions of the body, not extra effects of a higher dose.

Does vitamin B6 give you energy or improve mood?

B6 takes part in energy metabolism, but it is not a stimulant: in people who are not deficient, taking more does not increase energy. As for mood, the evidence on supplementation is preliminary and inconsistent, so it cannot be said that it improves mood or reduces stress.

Who needs to take vitamin B6 supplements?

People with a confirmed deficiency or at higher risk of deficiency, such as those with malabsorption conditions, heavy alcohol consumption, older people and those taking certain medicines. The decision should be taken with a healthcare professional, who can assess the need and the appropriate dose.

Are vitamin B6 gummies as effective as tablets?

There are no studies directly comparing gummies with vitamin B6 tablets. B6 is water-soluble and well absorbed, and the format does not change the nature of the vitamin. What matters is the amount per serving stated on the label and the quality of the supplement.

Can vitamin B6 be harmful in high doses?

Yes. Very high, prolonged doses can cause neurological problems, such as tingling or numbness. So you should not exceed the dose recommended on the label or take high doses without the advice of a healthcare professional.

Does vitamin B6 help with pregnancy nausea?

Some studies have assessed B6 for nausea and vomiting in pregnancy, but the evidence is not conclusive and ginger showed a significant effect in meta-analyses. During pregnancy, any supplement should be discussed with your doctor or obstetric team.