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What Vitamin B6 Does in Your Body

Vitamin B6, also called pyridoxine, is a water-soluble vitamin that plays many roles in how your body functions. Your body cannot store water-soluble vitamins, which means you need to get B6 from food or supplements regularly. This vitamin is involved in more than 100 enzyme reactions in your body, according to the National Institutes of Health. These reactions affect brain development, immune function, and how your body processes proteins and carbohydrates.

One of B6's main jobs is helping your body make neurotransmitters—chemicals that carry signals between your brain and nerves. This includes serotonin, dopamine, and norepinephrine, all of which affect mood and stress response. B6 also helps create myelin, the protective coating around your nerves, which is important for nerve communication throughout your body. Additionally, this vitamin helps your body process homocysteine, an amino acid that can damage blood vessels if it builds up too much.

B6 supports your immune system by helping your body produce antibodies and white blood cells that fight infections. The vitamin is also involved in hemoglobin production—hemoglobin is the protein in red blood cells that carries oxygen throughout your body. Without enough B6, your body cannot carry and distribute oxygen efficiently. Your body also uses B6 to regulate blood sugar levels and to metabolize fats.

The amount of B6 your body needs changes throughout your life. Adult men ages 19 to 50 need 1.3 milligrams daily, while men over 50 need 1.7 milligrams. Adult women ages 19 to 50 need 1.3 milligrams daily, and women over 50 need 1.5 milligrams. Pregnant women need 1.9 milligrams daily, and women who are breastfeeding need 2.0 milligrams. Children need less, ranging from 0.5 to 1.3 milligrams depending on age.

Practical takeaway: Understanding B6's role in your body helps you recognize why consistent intake matters. B6 affects everything from your mood to your immune response, which is why many people want to make sure they're getting enough.

Signs You Might Not Be Getting Enough B6

B6 deficiency is uncommon in the United States because many foods contain this vitamin and it's added to grain products. However, certain groups of people are more likely to have lower B6 levels. According to research from the National Institutes of Health, deficiency can develop in people with certain medical conditions, those taking specific medications, or those with limited food variety in their diets.

Symptoms of B6 deficiency can be subtle and develop slowly. Common signs include peripheral neuropathy, which causes tingling, numbness, or burning sensations in your hands and feet. Some people experience weakness or fatigue that makes daily activities feel draining. Others report trouble concentrating or memory problems. Mood changes are also possible, including irritability, depression, or unusual anxiety. Skin issues may appear, such as dermatitis (itchy or inflamed patches). Some people develop anemia, which causes fatigue and shortness of breath. Mouth sores or cracks in the lips may occur in severe cases.

Certain groups face higher risk of B6 deficiency. People with autoimmune diseases like rheumatoid arthritis or celiac disease may have trouble absorbing B6 from food. Individuals with kidney disease or those on dialysis lose B6 through their treatment. People taking medications such as certain diabetes drugs or tuberculosis medications can have lower B6 levels because these drugs interfere with how your body processes the vitamin. Older adults sometimes have lower intake or absorption issues. People who drink large amounts of alcohol may develop deficiency because alcohol interferes with how your body stores and uses B6.

If you're experiencing symptoms that might be related to B6 deficiency, a healthcare provider can order a test to measure your B6 level. The test measures pyridoxal-5-phosphate (PLP), which is the active form of B6 in your blood. A normal level is generally considered 30 nanomoles per liter or higher, though this can vary slightly between laboratories. Your healthcare provider can help determine whether your symptoms and test results indicate a deficiency that needs attention.

Practical takeaway: Recognizing potential B6 deficiency signs helps you decide whether to discuss this with a healthcare provider. Many symptoms of deficiency overlap with other conditions, so professional evaluation is important.

Foods That Contain Vitamin B6

Getting B6 from food is often the first step toward meeting your daily needs. Many common foods contain meaningful amounts of this vitamin. Chickpeas are an excellent plant-based source, providing about 1.3 milligrams per cooked cup. Salmon contains approximately 1.0 milligram per 3-ounce cooked portion. Chicken breast provides about 0.9 milligrams per 3-ounce serving. Bananas are a convenient fruit source with about 0.4 milligrams per medium banana. Potatoes and sweet potatoes are good sources too—a medium baked potato contains roughly 0.7 milligrams.

Other protein-rich foods contain substantial B6. Beef contains about 0.9 milligrams per 3-ounce serving. Tuna provides approximately 0.9 milligrams per 3-ounce can. Turkey offers similar amounts to chicken. For plant-based proteins, lentils contain about 0.4 milligrams per cooked cup, and tofu provides approximately 0.1 milligrams per 3-ounce serving. Nuts and seeds contribute smaller amounts—one ounce of sunflower seeds provides about 0.4 milligrams.

Vegetables and grains also contribute to B6 intake. Spinach, though better known for other nutrients, contains about 0.4 milligrams per cooked cup. Bell peppers offer about 0.3 milligrams per raw pepper. Broccoli provides about 0.6 milligrams per cooked cup. Many grain products are fortified with B6, meaning it's added during processing. A cup of fortified breakfast cereal can contain anywhere from 0.4 to 2.0 milligrams depending on the brand. Whole wheat bread typically has some natural B6, with about 0.1 milligrams per slice.

If you follow a specific diet, you can still meet your B6 needs. Vegetarians can rely on legumes, potatoes, bananas, and fortified grains. People following a vegan diet have the same plant-based options plus they should look for fortified plant-based milk and meat alternatives, which often have added B6. Those with gluten sensitivity or celiac disease can find B6 in naturally gluten-free foods like potatoes, rice, chicken, fish, legumes, and vegetables. Keeping a food diary for a few days can help you see whether your typical meals provide enough B6.

Practical takeaway: A varied diet including protein sources, vegetables, fruits, and grains provides most people with adequate B6. If your diet is limited, identifying B6-rich foods you enjoy makes it easier to meet your needs through food alone.

When People Consider B6 Supplements

Some people take B6 supplements because they cannot get enough from food alone or because a healthcare provider recommends it. Supplements come in several forms: pyridoxine hydrochloride (the most common form), pyridoxal-5-phosphate (the active form in your body), and pyridoxamine. They're available as tablets, capsules, liquids, and powders, and B6 is often included in B-complex vitamins that contain multiple B vitamins together. Dosages in over-the-counter supplements typically range from 2 milligrams to 100 milligrams per dose.

The recommended dietary allowance (RDA) for B6 is the amount that meets the needs of most healthy people. However, some people take higher amounts under medical supervision. The National Institutes of Health has established an upper limit of 100 milligrams per day for adults. Taking more than this regularly over time can potentially cause nerve damage, a condition called peripheral neuropathy. This is different from B6 deficiency-