What is riboflavin?

Riboflavin, also known as vitamin B2, is an essential, water-soluble vitamin from the B complex that plays a central role in energy metabolism, cell protection, and the nervous system. It is a component of important coenzymes involved in energy production, protein and fat metabolism, as well as antioxidant processes.

Riboflavin is heat-stable, but is destroyed by light, which is why it should be stored in light-resistant packaging. Since the body cannot store vitamin B2, a daily intake through the diet is necessary. Riboflavin is particularly active in the coenzyme forms FMN (flavin mononucleotide) and FAD (flavin adenine dinucleotide) - both indispensable molecules for the metabolism of every cell in the body.

How does riboflavin work in the body?

1. Energy production (ATP formation):
Riboflavin is a key element in the electron transport chain, the central process of energy production in the mitochondria.
As a component of the coenzymes FMN and FAD, it is involved in the oxidation of glucose, fatty acids, and amino acids and helps convert these nutrients into ATP (adenosine triphosphate) - the body's primary energy source.
A riboflavin deficiency can therefore lead to fatigue, lack of energy, and muscle weakness.

2. Protection against oxidative stress:
Riboflavin is necessary for the activity of the enzyme glutathione reductase, which regenerates the antioxidant glutathione. This protects cells from free radicals and prevents oxidative damage to DNA, proteins, and cell membranes. Thus, vitamin B2 contributes to cell health, skin regeneration, and immune system stability.

3. Support for the nervous system:
As part of numerous enzymatic reactions, riboflavin is important for the function of the central and peripheral nervous systems. It promotes the production of neurotransmitters such as dopamine and serotonin and contributes to mental clarity and emotional stability.

4. Healthy skin, mucous membranes, and eyes:
Riboflavin is involved in cell division and tissue regeneration, which has particularly positive effects on the skin, hair, nails, and mucous membranes.
A deficiency can lead to symptoms such as chapped lips, inflammation at the corners of the mouth (cheilitis), red eyesor scaly skin.
Riboflavin also protects the lens of the eye from oxidative stress and may help reduce the risk of cataracts.

5. Support for other vitamins:
Riboflavin is essential for the activation of other B vitamins, particularly vitamin B6 (pyridoxine) and vitamin B3 (niacin). Without sufficient riboflavin, these vitamins cannot perform their full function in metabolism.

Benefits of riboflavin

  • Promotes energy production and metabolic activity

  • Supports cell protection through its antioxidant effect

  • Improves skin, hair, and nail health

  • Promotes nerve function and mental performance

  • Protects the eyes and vision

  • Contributes to the activation of other B vitamins

  • Supports hormone and protein metabolism

  • Reduces tiredness and fatigue

Recommended daily intake

According to the German Nutrition Society (DGE):

  • Men: 1.3-1.5 mg per day

  • Women: 1.1-1.3 mg per day

  • Increased requirements for athletes, pregnant women, breastfeeding women, and people with high energy expenditure.

Since riboflavin is water-soluble, it should be obtained regularly through food - ideally spread across several small meals.

Natural sources of riboflavin

  • Milk and dairy products (yogurt, cheese, quark)

  • Eggs

  • Meat (especially liver, beef, pork)

  • Fish (mackerel, salmon)

  • Whole-grain products, rolled oats

  • Almonds, sunflower seeds

  • Green vegetables (broccoli, spinach)

Deficiency symptoms

Riboflavin deficiency (ariboflavinosis) is rare in industrialized countries but can occur with an unbalanced diet, alcohol abuse, or malabsorption disorders.
Typical symptoms:

  • Cracks and inflammation at the corners of the mouth (angular cheilitis)

  • Inflammation of the tongue (glossitis)

  • Skin problems (dermatitis)

  • Sensitivity to light, tired eyes

  • Fatigue, concentration problems

  • Poor wound healing

Long-term deficiency can impair the metabolism of other B vitamins and weaken the immune system.

Overdose and safety

An overdose is virtually impossible because excess riboflavin is excreted in the urine - which sometimes causes a harmless yellow discoloration.
Riboflavin is considered very safe and is well tolerated even in high doses.

Conclusion

Riboflavin (vitamin B2) is an essential vitamin for energy, cellular protection, and nerve health. It enables the efficient conversion of nutrients into energy, protects cells from oxidative stress, and contributes to a healthy appearance of the skin, eyes, and mucous membranes.

Adequate riboflavin intake is particularly important during physical exertion or increased metabolic activity to support performance, concentration, and recovery. A varied diet containing dairy products, whole grains, eggs, and green vegetables reliably meets the requirement.

Sources

  1. German Nutrition Society (DGE). (2020): Reference Values for Nutrient Intake - Riboflavin.

  2. Powers HJ. (2003): Riboflavin (vitamin B-2) and health. Am J Clin Nutr, 77(6), 1352–1360.

  3. Thurnham DI. (1990): Riboflavin: biochemical and physiological significance. J Hum Nutr Diet, 3(5), 325–333.

  4. Pinto JT, Rivlin RS. (2013): Riboflavin (vitamin B2). In: Modern Nutrition in Health and Disease, 11th Ed., Lippincott Williams & Wilkins.