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Riboflavin Intake – Vitamin B2 Requirements & Sources

Riboflavin intake refers to the daily consumption of Vitamin B2 through food and supplements. Adequate intake is essential for energy metabolism and cellular health.

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Things worth knowing about "Riboflavin Intake"

Riboflavin intake refers to the daily consumption of Vitamin B2 through food and supplements. Adequate intake is essential for energy metabolism and cellular health.

What Is Riboflavin Intake?

Riboflavin, commonly known as Vitamin B2, is a water-soluble vitamin that the body cannot produce in sufficient amounts on its own. Riboflavin intake describes the amount of this vitamin consumed daily through food or dietary supplements. Since the body stores only minimal amounts of riboflavin, a regular and consistent dietary intake is essential for maintaining health.

Biological Functions of Riboflavin

Riboflavin plays a wide range of critical roles in the human body:

Energy metabolism: Riboflavin is a key component of the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), both of which are essential for extracting energy from carbohydrates, fats, and proteins.
Antioxidant protection: The vitamin supports the glutathione system, helping to protect cells from oxidative damage.
Growth and cell division: Riboflavin is important for normal tissue growth and repair.
Nervous system function: It contributes to the proper functioning of the nervous system.
Iron metabolism: Riboflavin supports the absorption and utilization of iron.
Skin, hair, and mucous membranes: The vitamin promotes the health of skin and mucous membranes.

Dietary Sources

Riboflavin is found in a wide variety of foods. Particularly rich sources include:

Milk and dairy products (e.g., yogurt, cheese)
Meat, especially liver and organ meats
Fish (e.g., mackerel, salmon)
Eggs
Legumes (e.g., lentils, soybeans)
Green leafy vegetables (e.g., spinach, broccoli)
Fortified cereals and whole grain products
Nuts and seeds

Since riboflavin is sensitive to light, foods such as milk should not be exposed to direct sunlight for extended periods, as this can significantly reduce their vitamin content.

Recommended Daily Intake

The recommended daily intake of riboflavin varies depending on age, sex, and life stage. The European Food Safety Authority (EFSA) and the World Health Organization (WHO) provide the following reference values:

Adult men: approx. 1.4 mg per day
Adult women: approx. 1.1 mg per day
Pregnant women: approx. 1.4 mg per day
Breastfeeding women: approx. 1.6 mg per day
Children (7–10 years): approx. 0.9–1.0 mg per day

Individuals with high physical activity levels or certain medical conditions may require higher amounts.

Deficiency Symptoms

A riboflavin deficiency, also called ariboflavinosis, develops when intake is consistently too low. Common symptoms include:

Cracking and inflammation at the corners of the mouth (cheilosis)
Inflammation of the tongue and mouth lining (glossitis)
Skin changes, especially around the face and nose
Sensitivity to light and reddening of the eyes
Fatigue and general weakness
Impaired growth in children

Groups at higher risk of deficiency include people with highly restrictive diets, vegans and vegetarians without careful dietary planning, individuals with malabsorption disorders, and older adults.

Excessive Intake and Toxicity

Because riboflavin is water-soluble, any excess is typically excreted by the kidneys in urine. No toxic effects from high dietary riboflavin intake have been documented. At very high supplemental doses, urine may turn a bright yellow-orange color, which is harmless. The EFSA has not established a tolerable upper intake level (UL) for riboflavin, as no adverse effects from high intake have been reported.

Interactions

Riboflavin can interact with various substances and factors:

Alcohol: Regular alcohol consumption impairs the absorption and utilization of riboflavin.
Certain medications: Some antibiotics, tricyclic antidepressants, and chemotherapy agents can interfere with riboflavin metabolism.
Other B vitamins: Riboflavin works closely with niacin (Vitamin B3), pyridoxine (Vitamin B6), and folate, and is partly required for their activation in the body.

References

European Food Safety Authority (EFSA): Dietary Reference Values for riboflavin. EFSA Journal, 2017;15(8):4919. doi:10.2903/j.efsa.2017.4919
World Health Organization (WHO) and Food and Agriculture Organization (FAO): Human Vitamin and Mineral Requirements. FAO/WHO, Rome, 2004. Available at: https://www.who.int
Gropper, S.S. and Smith, J.L.: Advanced Nutrition and Human Metabolism. 7th edition. Cengage Learning, 2018.

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