What is the difference between riboflavin and riboflavin-5’-phosphate?

Standard riboflavin must be converted into its active coenzyme forms — FAD and FMN — through a phosphorylation step in the intestinal wall and cells. Riboflavin-5’-phosphate (also called FMN) is already phosphorylated — it is the active coenzyme form itself. For most people, the conversion is efficient, but for those with certain digestive conditions, genetic variations affecting flavokinase enzymes, or those taking medications that interfere with riboflavin metabolism, the active form provides a direct source of the usable coenzyme.

Why does B2 turn urine yellow?

You may notice that after taking a B complex supplement, your urine turns a bright yellow colour. This is completely harmless and is caused by riboflavin (vitamin B2). Riboflavin is a fluorescent yellow compound — in fact, the word “flavin” comes from the Latin “flavus” meaning yellow. Since B2 is water-soluble, any excess that your body does not immediately need is excreted through the kidneys, giving urine a distinctive yellow hue. This is simply a sign that your body has taken what it needs and is eliminating the rest.

What is the NRV for vitamin B2 and how much do you provide?

The EU Nutrient Reference Value (NRV) for vitamin B2 (riboflavin) is 1.4 mg per day. Our Vitamin B Complex provides exactly 1.4 mg of riboflavin-5’-phosphate (equivalent to 1.4 mg riboflavin) per serving — 100% NRV. This is a well-established reference dose that supports normal energy metabolism, vision, and skin maintenance for most healthy adults.

Can vitamin B2 help with headaches?

Some research has explored the relationship between vitamin B2 (riboflavin) and headache management. While this is not an EFSA-approved indication for B2, some clinical studies have investigated riboflavin supplementation for this purpose at significantly higher doses (typically 200–400 mg daily). The 1.4 mg in our Vitamin B Complex is a nutritional reference dose, not a high-dose therapeutic level. If you experience frequent headaches, we recommend consulting a healthcare professional for proper evaluation and management.

Ingredient Deep Dive · Riboflavin-5’-Phosphate (Active Vitamin B2)

Ingredient Riboflavin Phosphate

The active coenzyme form of vitamin B2 for energy, vision, and skin health.

Riboflavin-5’-phosphate is the biologically active, phosphorylated form of vitamin B2. Ready for your body to use without additional conversion. Found in our Vitamin B Complex.

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What is Riboflavin?

Riboflavin (vitamin B2) is a water-soluble B vitamin that serves as a precursor for the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). These flavocoenzymes are essential for numerous oxidation-reduction reactions in the body, playing a central role in the electron transport chain — the pathway responsible for the vast majority of cellular energy production. Riboflavin is also required for the metabolism of other B vitamins, including vitamin B6 and folate.

Riboflavin's active form, riboflavin-5'-phosphate (also called flavin mononucleotide), is the form that the body can use directly without enzymatic conversion. This is the form Nutri-Leaf uses in its Vitamin B Complex. Riboflavin contributes to the maintenance of normal vision, skin, and mucous membranes, and plays a role in iron metabolism. It also supports the body's antioxidant defences as a component of the glutathione reductase system.

EFSA-approved health benefits

The European Food Safety Authority (EFSA) has confirmed that riboflavin:

contributes to normal energy-yielding metabolism
contributes to the normal functioning of the nervous system
contributes to the maintenance of normal skin
contributes to the maintenance of normal mucous membranes
contributes to the maintenance of normal vision
contributes to the normal metabolism of iron
contributes to the protection of cells from oxidative stress
contributes to the reduction of tiredness and fatigue

Why we use Riboflavin in Nutri-Leaf formulas

Nutri-Leaf Vitamin B Complex uses riboflavin-5'-phosphate (the active coenzyme form of vitamin B2) rather than the more common riboflavin hydrochloride. The active form is immediately available to the body without requiring enzymatic conversion, making it particularly suitable for individuals with variations in riboflavin metabolism. Each capsule provides 1.4mg (100% NRV) as part of our comprehensive B vitamin complex.

Products containing Riboflavin

The Nutri-Leaf product featuring riboflavin is Vitamin B Complex, which delivers all eight B vitamins at 100% NRV per capsule in their active forms for energy metabolism, nervous system health, and the reduction of tiredness and fatigue.

Explore the role of B vitamins on our Energy & Vitality and Beauty from Within guides. Visit the Ingredient Philosophy page for insights into our active-form B vitamin approach.

Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.

Ingredient profile

Riboflavin-5-phosphate — a form of vitamin B2.

What it is
Riboflavin (vitamin B2) is a water-soluble B vitamin that serves as a precursor for the coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). Nutri-Leaf Vitamin B Complex uses riboflavin-5'-phosphate, the form the body can use directly.
Why we use it
Every ingredient in our formulas serves a specific nutritional purpose. What you see on the label is exactly what’s in the capsule.
German quality sourcing
All ingredients are sourced to meet German and EU pharmacopoeia quality standards, then manufactured into finished supplements in Germany by an FSSC 22000 certified food-supplement producer.
Benefits & research
Role in the body
Riboflavin contributes to normal energy-yielding metabolism, normal iron metabolism, the normal functioning of the nervous system and the maintenance of normal skin and mucous membranes.
Approved health claims
According to the European Food Safety Authority (EFSA), riboflavin contributes to normal energy-yielding metabolism, normal iron metabolism, the normal functioning of the nervous system, the maintenance of normal skin and mucous membranes, the protection of cells from oxidative stress and the reduction of tiredness and fatigue.
EU quality standards
Nutrient Reference Values (NRVs) are set by EU Regulation 1169/2011. Our formulas are designed to provide meaningful percentages of these reference values per daily serving.

Nutri-Leaf formulas featuring this ingredient

Supplements containing Riboflavin-5’-Phosphate (Active Vitamin B2).

Vitamin B Complex

Nutri-Leaf

Vitamin B Complex

1 capsule per dayHPMC vegetable capsule

~~€18,99~~€14,11

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Frequently asked questions

Your questions about Riboflavin-5’-Phosphate (Active Vitamin B2) and quality.

Standard riboflavin must be converted into its active coenzyme forms — FAD and FMN — through a phosphorylation step in the intestinal wall and cells. Riboflavin-5’-phosphate (also called FMN) is already phosphorylated — it is the active coenzyme form itself. For most people, the conversion is efficient, but for those with certain digestive conditions, genetic variations affecting flavokinase enzymes, or those taking medications that interfere with riboflavin metabolism, the active form provides a direct source of the usable coenzyme.
You may notice that after taking a B complex supplement, your urine turns a bright yellow colour. This is completely harmless and is caused by riboflavin (vitamin B2). Riboflavin is a fluorescent yellow compound — in fact, the word “flavin” comes from the Latin “flavus” meaning yellow. Since B2 is water-soluble, any excess that your body does not immediately need is excreted through the kidneys, giving urine a distinctive yellow hue. This is simply a sign that your body has taken what it needs and is eliminating the rest.
The EU Nutrient Reference Value (NRV) for vitamin B2 (riboflavin) is 1.4 mg per day. Our Vitamin B Complex provides exactly 1.4 mg of riboflavin-5’-phosphate (equivalent to 1.4 mg riboflavin) per serving — 100% NRV. This is a well-established reference dose that supports normal energy metabolism, vision, and skin maintenance for most healthy adults.
Some research has explored the relationship between vitamin B2 (riboflavin) and headache management. While this is not an EFSA-approved indication for B2, some clinical studies have investigated riboflavin supplementation for this purpose at significantly higher doses (typically 200–400 mg daily). The 1.4 mg in our Vitamin B Complex is a nutritional reference dose, not a high-dose therapeutic level. If you experience frequent headaches, we recommend consulting a healthcare professional for proper evaluation and management.

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Riboflavin-5’-phosphate — active B2 for vision, skin, and daily energy.

manufactured in Germany by an FSSC 22000 certified producer. Plant-based HPMC capsules. Free shipping from €49 across the EU.

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Free EU shipping from €49 · FSSC 22000-certified producer · Made in Germany · Plant-based capsules · Clean formulas

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Ingredient Riboflavin Phosphate

The active coenzyme form of vitamin B2 for energy, vision, and skin health.

What is Riboflavin?

EFSA-approved health benefits

Why we use Riboflavin in Nutri-Leaf formulas

Products containing Riboflavin

Riboflavin-5-phosphate — a form of vitamin B2.

Benefits & research

Supplements containing Riboflavin-5’-Phosphate (Active Vitamin B2).

Vitamin B Complex

Guides about ingredients and nutrition.

Zinc and Selenium: The Dynamic Duo for Immune Health

How to Read a Supplement Label Like a Nutritionist

The Beginner’s Guide to Building a Daily Supplement Routine

Your questions about Riboflavin-5’-Phosphate (Active Vitamin B2) and quality.

Riboflavin-5’-phosphate — active B2 for vision, skin, and daily energy.

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