Vitamin B
Vitamins support numerous functions in the body and ensure that the body's own processes function practically like many small cogwheels in various places.
What is vitamin B?
Technically speaking, vitamin B is not a single vitamin but a whole group of vitamins. This vitamin B complex is made of the following eight vitamins:
- Vitamin B1 (thiamine)
- Vitamin B2 (riboflavin)
- Vitamin B3 (niacin)
- Vitamin B5 (pantothenic acid)
- Vitamin B6 (pyridoxine, pyridoxamine and pyridoxal)
- Vitamin B7 (biotin)
- Vitamin B9 (folic acid)
- Vitamin B12 (cobalamin)
Another special feature of the vitamin group is that they are by no means similar or identical substances. On the contrary - they are completely different substances, both chemically and in terms of their effect. This is shown, among other things, by the fact that only a few B vitamins can be stored by the body, namely vitamin B12 and vitamin B3. However, both vitamins can only be stored in very limited quantities. The other B vitamins cannot be stored by the body at all, as they are water-soluble and are excreted from the body. This is why you need to take B vitamins regularly through food.
Effects of the vitamin B complex
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The members of the vitamin complex are all different, as are their effects in the body and the metabolic processes in which they are involved. Below you can find out more about the many different roles of the B vitamins in maintaining your health.
Vitamin B1
Vitamin B1, or thiamine, helps keep your mind and body healthy. Among other things, thiamine ensures the normal functioning of the nervous system, the heart and the psyche, which is why it is also popularly known as the mood vitamin.
If you drink a lot of coffee or black tea, this can inhibit this vitamin from being absorbed.
Vitamin B2
Vitamin B2, technically known as riboflavin, also has a variety of functions. It supports a normal energy metabolism and is responsible for maintaining normal blood cells. Since these properties are important for various growth processes, among other things, riboflavin is also known as a growth vitamin.
However, its positive effect on the eyes is also well known, as vitamin B2 contributes to the maintenance of normal vision.
When prepared gently, it can also be found in many foods after heating: Although this B vitamin does not tolerate light particularly well, it is relatively insensitive to heat.
Vitamin B3
Niacin, or vitamin B3, is important for the maintenance of normal normal mucous membranes and skin. It also helps to reduce tiredness and fatigue.
Niacin is found in many foods; however, the niacin from plants is utilised somewhat less effectively by the body than that from meat. Your body is able to produce vitamin B3 from the amino acid tryptophan, which is found in soya beans or peas.
Vitamin B5
If you want to stay alert, vitamin B5, also known as pantothenic acid, is your friend. Vitamin B5 supports energy metabolism and contributes to the normal synthesis of some neurotransmitters. Neurotransmitters are messenger substances of nerve cells. Pantothenic acid also contributes to a reduction in tiredness and fatigue and to the normal synthesis of vitamin D.
Vitamin B6
Vitamin B6 ensures a healthy protein balance and cysteine synthesis. Cysteine is an amino acid mainly found in hair and nails. It also contributes to normal nervous system function and helps regulate hormone activity. Vitamin B6 is really a collective term for several chemical substances (pyridoxine, pyridoxal and pyridoxamine) but they all occur together in many foods. Vitamin B6 is sensitive to heat, so foods containing it should be prepared carefully.
Vitamin B7
Vitamin B7 is probably best known to women as “biotin”. It plays a role in maintaining normal hair and skin. As these factors are important for our own well-being, there are now even biotin shampoos. Among other things, vitamin B7 contributes to the healthy metabolism of micronutrients (fat, carbohydrates and proteins) and the energy metabolism.
Vitamin B9
Vitamin B9 is water-soluble and primarily known as folate or folic acid, particularly important for pregnant women and women planning to have children. Folic acid plays an important role in growing maternal tissue during pregnancy. Folic acid also has a function in cell division and is indirectly involved in the multiplication of genetic material.
Vitamin B12
Like most vitamins, your body cannot produce vitamin B12 itself, or in technical terms, “cobalamin”. This B vitamin contributes to healthy red blood-cell formation, cell division, normal energy metabolism, while reducing fatigue and tiredness. Lastly, it supports the mental and nervous system functions.
Vitamin B12 is produced by micro-organisms in the soil, which are absorbed by animals. This means you can easily get enough vitamin B12 through animal products. Vegetarians and especially vegans can avoid deficiency by taking vitamin B12 supplements, after consulting a doctor. In addition to medicines, high-dose vitamin B12 supplements are also suitable for this purpose.
Food with B vitamins & daily requirements
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Since your body cannot store water-soluble vitamins, ensuring a sufficient daily intake through a balanced and varied diet is important. As different as the members of the vitamin B complex are, so are the daily requirements and the amounts contained in food.
Below we have listed the reference values of the German Nutrition Society (DGE). These provide an indication of the correct amounts of vitamins to consume. At the end of each overview, we provide tips on the appropriate diet.
All the following are average values according to Souci, Fachmann, Kraut: Food Composition and Nutrition Tables (7th ed.). Munich: C.H. Beck. 2008
Vitamin B1 - Reference values & food
Thiamin Referenzwerte
| Age | Thiamine mg/day - men | Thiamine mg/day - women |
|---|---|---|
| 1 to under 4 years | 0.6 mg | 0.6 mg |
| 4 to under 7 years | 0.7 mg | 0.7 mg |
| 7 to under 10 years | 0.9 mg | 0.8 mg |
| 10 to under 13 years | 1.0 mg | 0.9 mg |
| 13 to under 15 years | 1.2 mg | 1.0 mg |
| 15 to under 19 years | 1.4 mg | 1.1 mg |
| 19 to under 25 years | 1.3 mg | 1.0 mg |
| 25 to under 65 years | 1.2 mg | 1.0 mg |
| 65 years and older | 1.1 mg | 1.0 mg |
| Pregnant women - 2nd trimester | 1.2 mg | |
| Pregnant women - 3rd trimester | 1.3 mg | |
| Breastfeeding women | 1.3 mg |
Whole grain products, pulses, grains, as well as fish and meat are especially good thiamine sources. Here are some examples of small vitamin B1 bombs.
| Food | Thiamine per 100 g |
|---|---|
| Sunflower seeds | 1.9 mg |
| Dried peas | 0.8 mg |
| Oatmeal | 0.59 mg |
| Beef heart | 0.51 mg |
| Wheat (wholegrain) | 0.455 mg |
| Millet, husked | 0.433 mg |
| Natural rice | 0.41 mg |
| Rye, wholemeal | 0.368 mg |
| Chicken liver | 0.32 mg |
| Duck | 0.3 mg |
| Beef fillet | 0.1 mg |
| Wheat flour type 405 | 0.06 mg |
Vitamin B2 - Reference values & food
| Age | Riboflavin mg/day - men | Riboflavin mg/day - women |
|---|---|---|
| Children between 1 and 7 years | 0.7-0.8 mg | 0.7-0.8 mg |
| Children between 7 and 13 years | 1.0-1.1 mg | 0.9-1.0 mg |
| Youths between 13 and 19 years | 1.4-1.6 mg | 1.1-1.2 mg |
| Adults 19 years and above | 1.3-1.4 mg | 1.0-1.1 mg |
| Pregnant women from 2nd trimester | 1.3 mg | |
| Breastfeeding women | 1.4 mg |
Riboflavin is relatively resistant to heat but not sunlight. Therefore, store food in a dark place. For a diet rich in vitamin B2, use these foods:
| Food | Riboflavin per 100 g |
|---|---|
| Dried soybeans | 0.46 mg |
| Eggs | 0.408 mg |
| Saithe | 0.35 mg |
| Kale | 0.25 mg |
| Pork | 0.23 mg |
| Spinach | 0.202 mg |
| Whole milk | 0.18 mg |
| Broccoli | 0.178 mg |
Vitamin B3 - Reference values & food
| Age | Equivalent of niacin mg/day - men | Equivalent of niacin mg/day - women |
|---|---|---|
| Children between 1 and 7 years | 8-9 mg | 8-9 mg |
| Children between 7 and 13 years | 11-13 mg | 10-11 mg |
| Youths between 13 and 19 years | 15-17 mg | 13 mg |
| Adults 19 years and above | 14-16 mg | 11-13 mg |
| Pregnant women from 2nd trimester | 14-16 mg | |
| Breastfeeding women | 16 mg |
Fruit and vegetables contain very little niacin; however, animal products and mushrooms contain larger quantities.
| Food | Niacin per 100 g |
|---|---|
| Chicken liver | 12 mg |
| Oyster mushroom | 10 mg |
| Tuna | 8.5 mg |
| Beef (pure muscle) | 7.5 mg |
| Cultivated mushroom | 5.2 mg |
| Saithe | 4 mg |
| Lenses | 2.5 mg |
Vitamin B5 - Reference values & food
| Age | Pantothenic acid mg/day |
|---|---|
| Children between 1 and 10 years | 4 mg |
| Children and youths between 10 and 19 years | 5 mg |
| Adults 19 years and above | 5 mg |
| Pregnant women | 5 mg |
| Breastfeeding | 7 mg |
Pantothenic acid is mainly found in high concentration in offal, whole grain products, avocados, eggs and nuts.
| Food | Pantothenic acid per 100 g |
|---|---|
| Pork liver | 6.8 mg |
| Yeast | 3.5 mg |
| Peanut | 2.9 mg |
| Wheat bran | 2.5 mg |
| Natural rice | 1.7 mg |
| Dried soybeans | 1.7 mg |
| Eggs | 1.6 mg |
| Avocado | 1.1 mg |
Vitamin B6 – Reference values & food
| Age | Vitamin B6 mg/day - men | Vitamin B6 mg/day - women |
|---|---|---|
| Children between 1 and 4 years | 0.6 mg | 0.6 mg |
| Children between 4 and 7 years | 0.7 mg | 0.7 mg |
| Children between 7 and 10 years | 1.0 mg | 1.0 mg |
| Children between 10 and 13 years | 1.2 mg | 1.2 mg |
| Youths between 13 and 15 years | 1.5 mg | 1.4 mg |
| Youths between 15 and 19 years | 1.6 mg | 1.4 mg |
| Adults 19 years and above | 1.6 mg | 1.4 mg |
| Pregnant women in 1st trimester | 1.5 mg | |
| Pregnant women from 2nd trimester | 1.8 mg | |
| Breastfeeding women | 1.6 mg |
Vitamin B6 is also found in many foods. However, up to a third of the vitamin is released into water when cooked, so vegetables are best eaten steamed or raw if possible.
| Food | Vitamin B6 per 100 g |
|---|---|
| Soybeans | 1 mg |
| Sardine | 0.96 mg |
| Walnuts | 0.870 mg |
| Baker’s yeast | 0.7 mg |
| Mackerel | 0.63 mg |
| Pork liver | 0.59 mg |
| Beef fillet | 0.5 mg |
| Topside pork | 0.39 mg |
| Bananas | 0.363 mg |
| Potatoes | 0.307 mg |
| Carrots | 0.270 mg |
Vitamin B7 - Reference values & food
| Age | Biotin µg/day |
|---|---|
| Children between 1 and 4 years | 20 µg |
| Children between 4 and 10 years | 25 µg |
| Children between 10 and 15 years | 35 µg |
| Youths between 15 and 19 years | 40 µg |
| Adults 19 years and above | 40 µg |
| Pregnant women | 40 µg |
| Breastfeeding women | 45 µg |
Biotin is found in many foods in medium to high concentrations, so you can easily cover your daily requirements with a balanced and varied diet.
| Food | Biotin per 100g |
|---|---|
| Wheat bran | 44 µg |
| Pork liver | 27 µg |
| Eggs | 25 µg |
| Oat flakes | 20 µg |
| Spinach | 6,9 µg |
| Peas | 5,3 µg |
| Whole milk | 3,5 µg |
Vitamin B9 - Reference values & food
| Age | Folic acid µg/day |
|---|---|
| Children between 1 and 7 years | 120-140 µg |
| Children between 7 and 10 years | 180 µg |
| Children between 10 and 13 years | 240 µg |
| Youths between 13 and 19 years | 300 µg |
| Adults 19 years and above | 300 µg |
| Pregnant women | 550 µg |
| Breastfeeding women | 450 µg |
Folic acid or “folate” is mainly found in green vegetables.
| Food | Folic acid per 100 g |
|---|---|
| Baker’s yeast | 716 µg |
| Dried chickpeas | 340 µg |
| Dried soybeans | 250 µg |
| Wheat bran | 195 µg |
| Kale | 187 µg |
| Peas | 159 µg |
| Spinach | 145 µg |
| Lamb’s Lettuce | 145 µg |
Vitamin B12 - Reference values & food
| Age | Vitamin B12 µg/day |
|---|---|
| Children between 1 and 7 years | 1.5-2 µg |
| Children between 7 and 10 years | 2.5 µg |
| Children between 10 and 13 years | 3.5 µg |
| Youths between 13 and 19 years | 4 µg |
| Adults 19 years and above | 4 µg |
| Pregnant women | 4.5 µg |
| Breastfeeding women | 5.5 µg |
Vitamin B12 is almost only found in animal products.
| Food | Vitamin B12 per 100 g |
|---|---|
| Pork liver | 39 µg |
| Oysters | 15 µg |
| Saithe | 3,5 µg |
| Camembert | 3,1 µg |
| Beef fillet | 2 µg |
| Eggs | 1,9 µg |
Preventing vitamin B deficiency
You can provide enough B vitamins for yourself and your family through a balanced and varied diet. An excess of vitamin B is usually extracted through urine and many B vitamins are unlikely to be deficient with a balanced diet. Vegetarians or vegans should take measures to ensure they get enough vitamin B12, which is almost exclusively found in animal products.
More about vitamins & nutrients

Vitamins & minerals
Want to know what all the valuable micronutrients do, what foods have them and how much you need? Find more information here.
Find out more
Biotin
Biotin is known among nutritionists as a supporter of strong hair and beautiful skin and, like all B vitamins, plays a role in various metabolic processes in your body.
Find out more
Niacin
Niacin is better known as vitamin B3. It has many functions but is especially known for maintaining healthy mucous membranes and skin – after all, it is our largest organ.
Find out more



