Vitamin B2
Bioactive R5P

Pharmaceutical Grade

High-dose vitamin B2 in the form of riboflavin-5-phosphate (or flavin mononucleotide, FMN), a bioactive coenzyme form of vitamin B2. Highly bioavailable, with 100mg pharmaceutical grade vitamin B2 per capsule. With the addition of premium acacia fibre as a natural filler, sustainably cultivated in Africa. Vegan. 90 capsules
  • High-dose vitamin B2: 100mg per capsule
  • Bioactive coenzyme form: riboflavin-5-phosphate (or flavin mononucleotide/FMN)
  • Pharmaceutical grade active ingredient
  • Ideal for those with increased B2 requirements
  • Vitamin B2 supports energy and iron metabolism, the nervous system and the reduction of tiredness and fatigue
  • Vitamin B2 maintains skin and mucous membranes, red blood cells and vision as well as protecting cells against oxidative stress
  • Natural acacia fibre as the only other ingredient
90 capsules

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€436.12 / 1kg
In stock

Premium Bioactive Ingredients

  • High-dose vitamin B2: 100mg per capsule
  • Bioactive coenzyme form: riboflavin-5-phosphate (or flavin mononucleotide/FMN)
  • Directly bioavailable for important metabolic reactions
  • Ultra-pure vitamin B2, 100% vegan
  • High-quality, natural filler: acacia fibre cultivated without the use of plant protection products

How are we different?

The vitamin B2 contained in this formulation is the bioactive form of riboflavin-5-sodium phosphate. This directly active coenzyme is also known as flavin mononucleotide (FMN). Many vitamin B2 supplements contain the inactive precursor riboflavin instead, but this precursor must first be converted by the body into either flavin mononucleotide (FMN) or flavin adenine dinucleotide (FAD) to be utilised. Although FMN and FAD occur naturally in e.g. dairy products, vitamin B2 is often synthetically produced because its isolation is a complex and costly process. Given that the bioavailability of vitamin B2 from plant-based sources is significantly lower than that from animal products, we chose an ultra-pure, vegan, pharmaceutical grade active ingredient, which offers the highest possible combination of purity and bioavailability.

The only other ingredient is premium acacia fibre, cultivated without the use of plant protection products. In contrast to microcrystalline cellulose, a widely used synthetic filler often mixed with nanoparticles, gum arabic is a natural, fibre-rich food. Our fair trade acacia gum is climate neutral and is sustainably cultivated to conserve resources.

For the capsule shells we use custom-made HPMC capsules that, unlike most other HPMC and pullulan capsules on the market, are 100% free from controversial additives such as carrageenans and PEG. We then package this product in environmentally friendly amber glass.


  • Premium active ingredients in their purest form
  • Sourced directly from the world’s best producers
  • Our select raw materials are the basis of all our formulations
  • Complete avoidance of all unnecessary additives and adjuvants
  • Exclusive use of valuable natural ingredients for additives
  • We voluntarily declare all ingredients
  • All extractions performed without the use of chemical solvents
  • Custom production when necessary, in order to achieve the highest possible level of purity
  • Independent laboratory testing available on product pages
  • Raw materials sourced only from premium suppliers who are committed to fair working conditions
  • Amber glass and compostable pouches used for packaging
  • Vegan capsule shells, free from PEG and carrageenans
  • Packaged in the EU according to HACCP, GMP and ISO 22000:2018 standards
  • Stored in non-toxic containers
  • Shipped in mineral oil-free boxes
  • All products guaranteed 100% free from magnesium stearate, silicon dioxide, nanoparticles (no legal opportunism), genetic engineering, artificial colours and flavours, titanium dioxide and added sugar & sweeteners


Vitamin B2

B2 is a water-soluble vitamin which occurs in many forms: in the inactive, unbound form of riboflavin, in a protein-bonded form and in 2 bioactive coenzyme forms: flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). Both of these latter forms are important enzyme cofactors that regulate numerous metabolic processes and play important roles in many body functions including energy prduction, growth, embryonic development and the protection of nerve cells.

Natural sources of vitamin B2 include dairy products, eggs and meat. Grain, fruits and vegetables contain only small amounts of B2, and plant-based B2 is less bioavailable.

Health Benefits of Riboflavin (Vitamin B2)

According to the European Food Safety Authority (EFSA), vitamin B2 contributes to:

  • Normal energy metabolism
  • Normal functioning of the nervous system
  • Maintaining normal mucous membranes
  • Maintaining normal red blood cells
  • Maintaining normal skin
  • Maintaining normal vision
  • Normal iron metabolism
  • Protecting cells against oxidative stress
  • Reducing tiredness and fatigue


Recommended Dosage

Take 1 capsule (100mg vitamin B2 in the form of R5P) daily with 200ml water and a meal.

Daily Requirements

The EU has established a vitamin B2 nutrient reference value (NRV) of 14mg. The German Nutrition Society (DGE) has provided the following recommendations:

  • Babies: 0.3-0.4mg
  • Children and young adults (up to 15 years): 0.7-0.14mg
  • Young adults (15+ years) and adults: 1.2-1.6mg
  • Pregnancy: 1.3-1.4mg
  • Breastfeeding: 1.4mg

Food Supplement

Do not exceed the recommended dose. Food supplements cannot replace a balanced and varied diet. Keep out of reach of children.


Store in a cool, dry place away from direct sunlight and heat.


Ingredients: Acacia Fibre, Vitamin B2 (Riboflavin-5-Sodium Phosphate).
Capsule shells: Hydroxypropyl Methylcellulose.
Contains: 90 capsules

Ingredients/Capsule   % NRV*
Vitamin B2 (R5P) 100mg 7,143%

* Nutrient Reference Value

Per capsule: 100mg 
In total: 9,000mg/jar


All eight essential B vitamins work together. Numerous metabolic processes in the body require them; they can only achieve optimal functionality if each vitamin is in sufficient supply. Therefore, in many cases, it makes sense to supplement these vitamins together.

Product Details

German Pharmaceutical Number (PZN) 16850404
Origin Filler: Premium acacia fibre from Africa, gently processed in France
Production In-house production in Europe, bottling and encapsulation in the EU according to HACCP, GMP/ISO 22000:2018 standards
Finished products packaged in amber glass jars and stored in non-toxic containers
Shipping in mineral oil-free boxes
Capsules Plant-based cellulose (HPMC). Vegan
Premium HPMC quality: Free from controversial additives such as carrageenans and PEG
Packaging Amber glass jar to protect against light and oxidation (free from plasticisers and BPA)
To Reuse Remove product label by soaking the jar in warm water for 5 minutes. Glue residue can be removed with dish soap

Sunday Natural

Our Philosophy

For thousands of years, cultures all over the world have been using medicinal plants and nutritious foods to naturally foster and maintain vitality and good health.

With our products, we try to emulate this ancient wisdom as much as possible.

Consequently, our philosophy is simple: everything we do meets the highest standards of quality and purity; our focus is on organic and natural ingredients.

We follow this philosophy with meticulous care on all levels and down to every last detail.

Learn more.

Our recommendations

Welcome! Which language would you like to use?

The image could not be loaded.