Vitamin B6 (Pyridoxine) Deficiency
What is Vitamin B6 (Pyridoxine) Deficiency?
Vitamin B6, also called pyridoxine, is a nutrient your body needs to make proteins, balance blood sugar, and support brain function. It also helps your body process amino acids, the building blocks of protein. Your body cannot make vitamin B6 on its own, so you need to get it from food or supplements.
When you do not get enough vitamin B6, your body cannot perform these essential tasks properly. This deficiency can affect your nervous system, immune function, and how your cells produce energy. B6 also plays a key role in converting homocysteine, an amino acid, into other useful compounds. Without enough B6, homocysteine can build up in your blood.
Most people get enough vitamin B6 from a balanced diet. But certain health conditions, medications, and dietary patterns can increase your risk. Catching a deficiency early helps prevent long-term complications like nerve damage and heart health issues.
Symptoms
- Skin rashes, especially around the mouth, eyes, and nose
- Cracked or sore lips and tongue
- Fatigue and low energy levels
- Mood changes, including irritability, depression, or confusion
- Tingling or numbness in hands and feet
- Weakened immune system with frequent infections
- Anemia, which causes pale skin and shortness of breath
- Seizures in severe cases
Some people with mild vitamin B6 deficiency have no noticeable symptoms at first. The signs often develop gradually over months or years.
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Causes and risk factors
Vitamin B6 deficiency usually happens when your diet lacks B6-rich foods like poultry, fish, potatoes, chickpeas, bananas, and fortified cereals. People who eat very restricted diets or have poor nutrition are at higher risk. Alcohol use can also deplete vitamin B6 because it interferes with how your body absorbs and uses the nutrient.
Certain medications reduce B6 levels, including some drugs used to treat tuberculosis, asthma, and high blood pressure. Digestive disorders like Crohn's disease, celiac disease, and ulcerative colitis can prevent your body from absorbing B6 properly. Kidney disease and autoimmune conditions also increase your risk. Pregnant and breastfeeding women need more B6, which can lead to deficiency if dietary intake does not increase.
How it's diagnosed
Your doctor diagnoses vitamin B6 deficiency by reviewing your symptoms, diet, medications, and medical history. Blood tests measure vitamin B6 levels directly or check for signs of deficiency. One important marker is homocysteine, an amino acid that rises when B6 levels are low. Elevated homocysteine can indicate that your body lacks the B6 needed to process this compound properly.
Rite Aid offers homocysteine testing as an add-on to our blood testing service. This test helps identify whether high homocysteine levels may be related to B6 deficiency or other nutrient imbalances. Your doctor may also check for anemia and other signs that suggest low B6. Getting tested gives you the information you need to address deficiency before it causes serious complications.
Treatment options
- Eat more B6-rich foods like chicken, turkey, salmon, tuna, potatoes, bananas, chickpeas, and fortified cereals
- Take vitamin B6 supplements if recommended by your doctor, usually 1.3 to 2 milligrams daily for adults
- Address underlying causes like digestive disorders, kidney disease, or medication side effects
- Limit alcohol intake, which interferes with B6 absorption and metabolism
- Work with your doctor to adjust medications that may be depleting your B6 levels
- Retest homocysteine and other markers after treatment to confirm your levels are improving
- Consider a multivitamin that includes B6 if you have dietary restrictions or increased needs
Need testing for Vitamin B6 (Pyridoxine) Deficiency? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Chicken, turkey, salmon, tuna, and other fish are excellent sources of vitamin B6. Plant-based options include potatoes, sweet potatoes, bananas, chickpeas, and fortified breakfast cereals. Most people can meet their B6 needs by including these foods in their regular diet.
Vitamin B6 helps your body convert homocysteine into other useful compounds through a process called transsulfuration. When B6 is low, this conversion slows down and homocysteine accumulates in your blood. High homocysteine levels can increase your risk of heart disease and other health problems.
Yes, severe or long-term vitamin B6 deficiency can damage your nerves, a condition called peripheral neuropathy. This causes tingling, numbness, or pain in your hands and feet. Catching and treating deficiency early can prevent permanent nerve damage.
Most people see improvement in symptoms within a few weeks of starting B6 supplementation or dietary changes. Homocysteine levels typically decrease within 4 to 8 weeks of treatment. Your doctor may retest your blood to confirm that your levels have returned to normal.
People with kidney disease, digestive disorders, or autoimmune conditions are at higher risk. Those who drink alcohol heavily or take certain medications also have increased risk. Pregnant women, older adults, and people with very restricted diets may need extra B6.
Yes, taking very high doses of vitamin B6 supplements over long periods can cause nerve damage. The upper limit for adults is 100 milligrams per day from supplements. It is very difficult to get too much B6 from food alone, so focus on dietary sources when possible.
Yes, vitamin B6 is needed to make hemoglobin, the protein in red blood cells that carries oxygen. Without enough B6, your body may produce smaller, less effective red blood cells. This type of anemia can cause fatigue, pale skin, and shortness of breath.
Some tuberculosis drugs, certain asthma medications, and some drugs used to treat high blood pressure can lower B6 levels. Oral contraceptives and hormone replacement therapy may also increase B6 needs. Talk to your doctor if you take any of these medications and have symptoms of deficiency.
Severe vitamin B6 deficiency is rare in developed countries because many foods contain B6. However, mild deficiency is more common in people with digestive disorders, kidney disease, or alcohol dependence. Testing your homocysteine levels can help identify potential deficiency.
Vitamin B6 helps your brain make neurotransmitters like serotonin, dopamine, and GABA, which regulate mood, sleep, and stress. Low B6 levels can lead to mood changes, depression, confusion, and memory problems. Getting enough B6 supports mental clarity and emotional balance.