Vitamin B complex guide

An Essential Guide Of Vitamin B Complex

What is vitamin B complex? Why these vitamins are so important for our health, especially for our nervous system.

First, let’s see what are B vitamins and what are the eight types of B vitamin complex.

What are B vitamins?

B vitamins are important for making sure the body’s cells are functioning properly. They help the body convert food into energy (metabolism), create new blood cells, and maintain healthy skin cells, brain cells, and other body tissues.

There are eight types of B vitamin:
  • thiamin (vitamin B-1)
  • riboflavin (vitamin B-2)
  • niacin (vitamin B-3)
  • pantothenic acid (vitamin B-5)
  • vitamin B-6
  • biotin (vitamin B-7)
  • folate (vitamin B-9)
  • vitamin B-12

Together, they are called the vitamin B complex.

B vitamins often occur together in the same foods. Many people can get enough B vitamins by eating a variety of nutrient-dense foods.

However, those who struggle to meet their daily needs can use supplements.

People may develop B vitamin deficiencies if they do not get enough of the vitamins from their diet or supplements.

They may also have a deficiency if their body cannot absorb nutrients properly, or if their body eliminates too much of them due to certain health conditions or medications.

Vitamin B Complex – Vitamins

Thiamin (vitamin B-1)

The heart, liver, kidney, and brain all contain high amounts of thiamin.

The body needs thiamin for:

  • breaking down sugar (carbohydrate) molecules from food
  • creating certain neurotransmitters (brain chemicals)
  • producing fatty acids
  • synthesizing certain hormones
Foods with thiamin

Thiamin is present in:

  • whole grains and fortified bread, cereal, pasta, and rice
  • pork
  • trout
  • mussels
  • acorn squash
  • legumes, such as black beans and soybeans
  • seeds
  • nuts

Thiamin deficiency is not common in the United States. However, certain groups of people may not get enough thiamin, including:

  • those with alcohol dependence
  • older adults
  • those with HIV or AIDS
  • those with diabetes
  • those who have heart failure
  • those who have had bariatric surgery
Symptoms of thiamin deficiency

A person with a thiamin deficiency may experience:

  • weight loss
  • little or no appetite
  • memory problems or confusion
  • heart problems
  • tingling and numbness in the hands and feet
  • loss of muscle mass
  • poor reflexes

Alcohol dependence can cause a person to develop a thiamin deficiency. This can cause Wernicke-Korsakoff syndrome (WKS), which may result in tingling and numbness in the hands and feet, memory loss, and confusion.

Riboflavin (vitamin B-2)

Riboflavin is essential for:

  • energy production
  • helping the body break down fats, drugs, and steroid hormones
  • converting tryptophan into niacin (vitamin B-3)
  • converting vitamin B-6 into a coenzyme that the body needs
Foods with riboflavin
  • organ meats
  • fortified breakfast cereals
  • oatmeal
  • yogurt and milk
  • mushrooms
  • almonds
Symptoms of riboflavin deficiency

Riboflavin deficiency is rare but may occur when a person has an endocrine disorder, such as thyroid problems, or certain other conditions.

A person who is deficient in riboflavin may experience:

  • skin disorders
  • sores at the corners of the mouth
  • swelling of the mouth and throat
  • swollen, cracked lips
  • hair loss
  • red, itchy eyes

Having a severe riboflavin deficiency can lead to anemia and cataracts. Being riboflavin deficient during pregnancy can create a higher risk of certain birth defects.

People at highest risk of riboflavin deficiency include:

  • those following a vegan diet or who do not consume dairy products
  • athletes who do not eat meat, especially those who also do not eat dairy or other animal products
  • women who are pregnant or lactating, especially those who do not consume meat or dairy products
Niacin (vitamin B-3)

The body converts niacin into a coenzyme called nicotinamide adenine dinucleotide (NAD).

NAD is a necessary part of more than 400 different enzyme reactions in the body, the highest of all vitamin-derived coenzymes.

These enzymes help with:

  • changing the energy in carbohydrates, fats, and proteins into a form the body can use
  • metabolic processes in the body’s cells
  • communication among cells
  • expression of DNA in cells
Foods with niacin

Animal-based foods such as meat, poultry, and fish are high in NAD, which the body can easily use.

Plant-based foods including nuts, legumes, and grains contain a natural form of niacin that the body cannot use as easily.

However, manufacturers add niacin to foods such as cereals, and the body can easily use this form.

Symptoms of niacin deficiency

Getting too little niacin can cause a niacin deficiency.

Severe niacin deficiency leads to pellagra, which may cause:

  • brown discoloration on skin exposed to sunlight
  • patches of skin with a rough appearance
  • a bright red tongue
  • vomiting, diarrhea, or constipation
  • headache
  • fatigue
  • depression

If pellagra goes untreated, it can lead to severe memory problems, behavioral changes, and suicidal behavior.

It may also lead to an extreme loss of appetite or death.

People at risk of niacin deficiency include those who have:

  • malnutrition
  • anorexia nervosa
  • alcohol use disorder
  • AIDS
  • inflammatory bowel disease (IBD)
  • Hartnup disease
  • carcinoid syndrome, which causes tumors to develop in the gastrointestinal tract
Pantothenic acid (vitamin B-5)

Pantothenic acid is necessary for the body to create new coenzymes, proteins, and fats.

Red blood cells carry pantothenic acid throughout the body so it can use the nutrient in a variety of processes for energy and metabolism.

Foods with pantothenic acid

Many foods contain at least some pantothenic acid, but some of the highest amounts are present in:

  • beef liver
  • shiitake mushrooms
  • sunflower seeds
  • chicken
  • tuna
  • avocados
  • fortified breakfast cereals
Symptoms of pantothenic acid deficiency

Pantothenic acid deficiency is rare in the U.S. because it is plentiful in many foods.

However, it may affect people with severe malnutrition. In such cases, they are usually deficient in other nutrients as well.

  • numbness and burning of the hands and feet
  • headache
  • irritability
  • restlessness and poor sleep
  • a lack of appetite

People with a specific gene mutation called pantothenate kinase-associated neurodegeneration 2 mutations are at a high risk of deficiency.

Vitamin B-6

Vitamin B-6, or pyridoxine, plays a role in more than 100 enzyme reactions.

The body needs vitamin B-6 for:

  • amino acid metabolism
  • breaking down carbohydrates and fats
  • brain development
  • immune function
Foods with vitamin B-6
  • organ meats
  • chickpeas
  • tuna
  • salmon
  • poultry
  • potatoes
  • fortified cereals
Symptoms of vitamin B-6 deficiency

Many deficiencies in vitamin B-6 are linked to low levels of vitamin B-12, according to the National Institutes of Health (NIH) Office of Dietary Supplements.

Vitamin B-6 deficiency may cause:

  • anemia
  • scaling on the lips
  • cracks at corners of the mouth
  • swollen tongue
  • weakened immune system
  • confusion
  • depression

People at risk of a vitamin B-6 deficiency include those who have:

  • renal (kidney) disease
  • had a kidney transplant
  • celiac disease
  • Crohn’s disease
  • ulcerative colitis
  • autoimmune disorders such as rheumatoid arthritis
  • alcohol dependence
Biotin (vitamin B-7)

Manufacturers add biotin to many hairs, skin, and nail supplements. However, the NIH state that there is not sufficient evidence to conclude whether taking extra biotin helps with hair, skin, or nails.

Some people believe that biotin may help with psoriasis.

The human body needs biotin for:

  • breaking down fats, carbohydrates, and protein
  • communication among cells in the body
  • regulation of DNA
Foods with biotin
  • organ meats
  • eggs
  • salmon
  • pork
  • beef
  • sunflower seeds
Symptoms of biotin deficiency
  • thinning of the hair
  • a scaly rash around eyes, nose, and mouth
  • brittle nails
  • depression
  • fatigue

Deficiency is rare in the U.S., but the following groups may be more at risk:

  • people with a metabolic disorder called biotinidase deficiency
  • people with an alcohol use disorder
  • women who are pregnant or lactating

Read More: Biotin For Hair Growth: Dosage and Side Effects 

Folate (vitamin B-9)

Avocados and some fortified slices of bread are healthful sources of folate.

The natural form of vitamin B-9 is called folate. Folic acid, which is present in fortified foods and some supplements, is a synthetic form of the vitamin.

Because most people cannot take in enough leafy green vegetables for the levels needed in pregnancy, the Centers for Disease Control and Prevention (CDC) suggest that all women of reproductive age who wish to conceive take 400 mcg of folic acid each day, alongside eating a varied diet that contains folate.

When a woman has high enough levels of folate both before and during pregnancy, the fetus has a lower risk of certain birth defects affecting the brain and spinal cord.

Folate is also essential for:
  • DNA replication
  • metabolism of vitamins
  • metabolism of amino acids
  • proper cell division
Foods with folate

The FDA requires manufacturers to add folic acid to standardized enriched grain products to help reduce the risk of neural tube defects. People can get folic acid from fortified slices of bread and cereals.

Natural folate occurs in:
  • dark green leafy vegetables
  • beef liver
  • avocado
  • papaya
  • orange juice
  • eggs
  • beans
  • nuts
Symptoms of folate deficiency

The addition of folic acid to grain products has made folate deficiency uncommon. However, the possible symptoms of a folate deficiency may include:

  • weakness
  • headache
  • heart palpitations
  • irritability
  • sores on the tongue or in the mouth
  • skin, hair, or nail changes

The FDA recommends that women increase the intake of folates and take folic acid supplements every day before becoming pregnant and during pregnancy.

Other groups who may need extra folate include people who have:

  • alcohol use disorder
  • celiac disease
  • conditions that interfere with nutrient absorption
  • IBD

People should not take more than 1,000 mcg of folic acid each day. Taking more than this can mask symptoms of a vitamin B-12 deficiency. This can cause permanent nerve damage.

Vitamin B-12

Vitamin B-12 contains the mineral cobalt and is sometimes called a “cobalamin.” The body uses vitamin B-12 for:

  • creating new red blood cells
  • DNA synthesis
  • brain and neurological function
  • fat and protein metabolism
Foods with vitamin B-12

Vitamin B-12 occurs naturally in animal products such as:

  • clams
  • beef liver
  • salmon
  • beef
  • milk and yogurt

People who do not eat animal products may need to get vitamin B-12 from supplements or fortified foods such as breakfast cereals and nutritional yeast.

Read More: Vegetarian Sources of Vitamin B-12 

Symptoms of vitamin B-12 deficiency

Vitamin B-12 deficiency usually causes a condition called megaloblastic anemia.

  • fatigue
  • weight loss
  • constipation
  • loss of appetite
  • numbness and tingling in the hands and feet
  • memory problems
  • depression

People who are at risk of a B-12 deficiency include those who have:

  • conditions that interfere with the absorption of nutrients
  • older adults
  • celiac disease
  • Crohn’s disease
  • had gastric bypass surgery or surgery on the stomach

Vegetarians, vegans, and people who are pregnant or lactating may also need extra vitamin B-12.

How much vitamin B complex do you need?

The recommended daily amount of each B vitamin varies.

For women, the recommended daily intake is:

B-1: 1.1 milligrams (mg)
B-2: 1.1 mg
B-3: 14 mg
B-5: 5 mg (RDA not established)
B-6: 1.3 mg
biotin: 30 micrograms (mcg) (RDA not established)
folic acid: 400 mcg
B-12: 2.4 mcg

For men, the recommended daily intake is:

B-1: 1.2 mg
B-2: 1.3 mg
B-3: 16 mg
B-5: 5 mg (RDA not established)
B-6: 1.3 mg
biotin: 30 mcg (RDA not established)
folic acid: 400 mcg
B-12: 2.4 mcg

Older adults and women who are pregnant require higher amounts of B vitamins. Your doctor can provide dosage information tailored to your individual needs.

Certain underlying health conditions can prevent your body from properly absorbing vitamin B.

You should also talk to your doctor about your vitamin B intake if you have:

  • celiac disease
  • HIV
  • Crohn’s disease
  • alcohol dependence
  • kidney conditions
  • rheumatoid arthritis
  • ulcerative colitis
  • inflammatory bowel disease

Conclusion: Vitamin B complex or B vitamins are very important for our health. Especially for our nervous system. If you notice some of these symptoms of vitamin B deficiency it is good to consult with your doctor and change your diet or start taking supplements.


Vitamin B complex guide

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