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Riboflavin Phosphate – Active Form of Vitamin B2

Riboflavin phosphate is the biologically active form of vitamin B2 and an essential cofactor for numerous metabolic processes in the human body.

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Things worth knowing about "Riboflavin phosphate"

Riboflavin phosphate is the biologically active form of vitamin B2 and an essential cofactor for numerous metabolic processes in the human body.

What is Riboflavin Phosphate?

Riboflavin phosphate, also known as riboflavin-5-phosphate or flavin mononucleotide (FMN), is the phosphorylated, biologically active form of vitamin B2 (riboflavin). It is a water-soluble micronutrient that serves as a critical cofactor for a wide range of enzymatic reactions in the body. Riboflavin phosphate is indispensable for energy metabolism, fat metabolism, and antioxidant defense.

Biological Functions

Riboflavin phosphate plays central roles in the human body as a prosthetic group of flavoproteins. Key functions include:

Energy production: As a component of flavoenzymes, FMN participates directly in the electron transport chain and thereby in the production of ATP (adenosine triphosphate).
Macronutrient metabolism: Riboflavin phosphate is required for the breakdown of carbohydrates, fats, and proteins.
Antioxidant protection: It contributes to the regeneration of glutathione, one of the most important antioxidant molecules in the body.
Activation of other B vitamins: Riboflavin phosphate is necessary for the conversion of vitamin B6 and folate into their active forms.
Iron metabolism: FMN supports the absorption and utilization of iron in the body.

Dietary Sources

Riboflavin and its active forms are found in a wide range of foods. Particularly rich sources include:

Milk and dairy products (e.g., cheese, yogurt)
Meat, especially liver and other organ meats
Fish and seafood
Eggs
Legumes (e.g., lentils, beans)
Green leafy vegetables (e.g., spinach, broccoli)
Fortified grain products

Recommended Daily Intake

The recommended daily intake of vitamin B2 and its active form riboflavin phosphate varies by age, sex, and life circumstances. According to the World Health Organization (WHO) and national dietary guidelines, the following reference values apply for adults:

Men: approximately 1.3–1.7 mg per day
Women: approximately 1.1–1.3 mg per day
Pregnant women: approximately 1.4 mg per day
Breastfeeding women: approximately 1.6 mg per day

Deficiency Symptoms

A deficiency in riboflavin phosphate or vitamin B2 is rare in industrialized countries but can occur in certain at-risk groups. Typical symptoms of deficiency include:

Cracks at the corners of the mouth (angular cheilitis) and sore lips
Inflammation of the oral mucosa and tongue (glossitis)
Light sensitivity and red, burning eyes
Skin changes, particularly seborrheic dermatitis
Fatigue and general weakness
Nerve sensitivity (peripheral neuropathy)

At-risk groups for deficiency include older adults, vegans and vegetarians, individuals with malabsorption disorders, and those with high alcohol consumption.

Riboflavin Phosphate as a Dietary Supplement

In dietary supplements, riboflavin phosphate is often preferred over free riboflavin because it is considered the more bioavailable form. The phosphorylated form does not need to be activated in the body and can be used directly as a cofactor. It is particularly relevant for individuals who have difficulty converting riboflavin into its active form.

Safety and Toxicity

Riboflavin phosphate is considered very safe. Because it is a water-soluble compound, any excess is excreted via the kidneys. No significant toxic effects from high-dose supplementation have been reported. A harmless side effect is the intensely yellow-orange coloration of urine at higher doses.

References

World Health Organization (WHO) & Food and Agriculture Organization (FAO): Human Vitamin and Mineral Requirements. Report of a Joint FAO/WHO Expert Consultation, Bangkok, Thailand. FAO, Rome, 2001.
Powers HJ: Riboflavin (vitamin B-2) and health. American Journal of Clinical Nutrition. 2003;77(6):1352–1360.
Suwannasom N et al.: Riboflavin: The Health Benefits of a Forgotten Natural Vitamin. International Journal of Molecular Sciences. 2020;21(3):950.

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