What is Vitamin B6?
Vitamin B6, also known as pyridoxine, is a water-soluble vitamin involved in over 100 enzymatic reactions in the body. It is one of the most versatile vitamins — from protein and amino acid metabolism to neurotransmitter synthesis.
B6 occurs in food in three main forms: pyridoxine (in plant foods), pyridoxal and pyridoxamine (in animal foods). All three are converted in the body to the active form — pyridoxal 5'-phosphate (PLP).
Good sources of vitamin B6 include chicken breast, fish, potatoes, bananas, chickpeas and whole grains.
How does Vitamin B6 work?
Pyridoxal 5'-phosphate (PLP) is the active coenzyme form of vitamin B6. It is primarily involved in amino acid metabolism — transamination, decarboxylation and dehydration. This means B6 is directly linked to the breakdown and synthesis of proteins.
Additionally, B6 is required for the synthesis of neurotransmitters — serotonin, dopamine and gamma-aminobutyric acid (GABA). These substances play a key role in mood, sleep and stress response.
B6 also participates in glycogen breakdown (releasing energy stores from muscles), haemoglobin synthesis and immune cell formation.
Evidence and benefits
EFSA has approved the following health claims for vitamin B6:
- Contributes to normal protein and glycogen metabolism — required for amino acid and energy store metabolism
- Contributes to normal functioning of the nervous system — supports neurotransmitter synthesis
- Contributes to normal psychological function — serotonin and dopamine production
- Contributes to normal red blood cell formation — required for haemoglobin synthesis
- Contributes to normal function of the immune system — supports lymphocyte development
- Contributes to the regulation of hormonal activity — influences steroid hormone action
- Contributes to the reduction of tiredness and fatigue — important for energy metabolism
How to take Vitamin B6
The recommended daily intake for adults is 1.4 mg. Most people obtain sufficient amounts from a varied diet.
In supplements, B6 is available mainly in two forms:
- Pyridoxine hydrochloride — the most common and affordable form
- Pyridoxal 5'-phosphate (P5P) — the active form that does not require conversion in the liver
It is important not to exceed the upper safe limit. EFSA has set the tolerable upper intake level for adults at 25 mg per day. Prolonged overconsumption can cause peripheral neuropathy (numbness and tingling in the extremities).
B6 is well absorbed both on an empty stomach and with food.
Who should consider B6 supplementation?
- Athletes and active individuals — intense training increases protein metabolism and thus B6 requirements
- Women taking hormonal contraceptives — these may lower B6 levels
- Older adults — B6 absorption and metabolism may decline with age
- People with high protein intake — a protein-rich diet requires more vitamin B6
- Heavy alcohol consumers — alcohol interferes with B6 metabolism
Frequently asked questions
Does B6 help with PMS symptoms?
Vitamin B6 contributes to the regulation of hormonal activity. Some women use B6 supplements to ease menstrual cycle-related discomfort, but results vary between individuals.
What happens with B6 deficiency?
B6 deficiency is relatively rare but can manifest as dermatitis, cracked lips (cheilosis), anaemia and confusion. Severe deficiency can cause peripheral neuropathy.
Should I take B6 and B12 together?
B vitamins often work synergistically. The collaboration of B6, B12 and folic acid is particularly important in homocysteine metabolism.
Does B6 affect sleep?
B6 participates in melatonin synthesis (via serotonin). Adequate B6 levels support a normal sleep-wake cycle.
Can too much B6 be dangerous?
Yes, prolonged intake above 25 mg per day can cause nerve damage. Follow recommended dosages and do not exceed the upper safe limit.
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Disclaimer
A food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle.
