Vitamin B1


High-dose vitamin B1 (thiamine) in the form of thiamine hydrochloride, suitable for individuals with high vitamin B1 requirements. 250mg of pharmaceutical grade vitamin B1 per capsule. Vegan, no additives. 2x100 capsules
  • High-dose thiamine: 250mg vitamin B1 per capsule
  • Pharmaceutical grade thiamine hydrochloride
  • Bioavailable and stable form
  • Ideal for those with increased B1 requirements
  • Vitamin B1 supports energy metabolism and heart function as well as the nervous system and psyche
Customize High-Dose<br>Vitamin B1<br>Thiamine
2 x High-Dose Vitamin B1 Thiamine Capsules   + €0.00

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€18.80 €19.80

2x100 capsules

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€241.03 / 1kg

Premium Bioactive Ingredients

  • Vitamin B1 (thiamine) in the form of thiamine hydrochloride
  • Stable and most bioavailable form of vitamin B1
  • Vegan, pharmaceutical grade active ingredient
  • High-dose thiamine: 250mg vitamin B1 per capsule

How are we different?

Our vitamin B1 is contained here in the form of thiamine hydrochloride, a stable and very potent form of vitamin B1. Since the active form of vitamin B1 is not approved as a food supplement in Germany, we have chosen a particularly high-quality, vegan, pharmaceutical grade active ingredient with the highest possible bioavailability and purity.

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 B1 (Thiamine)

Vitamin B1 (thiamine) is the precursor of the coenzyme thiamine pyrophosphate (TPP, or thiamine diphosphate, TDP), which fulfils numerous important functions in the body. Vitamin B1 is found in almost all organs and tissues of the body and has a decisive influence on the central and peripheral nervous system, where it is particularly important for signal transmission between nerves and muscles. Vitamin B1 also contributes to nervous system regeneration.

Vitamin B1 is also involved in the metabolism of some neurotransmitters such as acetylcholine and thus contributes to normal psychological function.

Another important area for vitamin B1 is in the extraction of energy from food. TPP, a coezyme, is crucial in the citrate cycle of the mitochondria, where it plays a key role in the aerobic breakdown of glucose.

Health Benefits of Vitamin B1

According to the European Food Safety Authority (EFSA), Vitamin B1 contributes to:

  • Normal functioning of the nervous system
  • Normal energy metabolism
  • Normal mental function
  • Normal heart function


Recommended Dosage

Take 1 capsule (250mg vitamin B1) with 200ml water daily.

Daily Requirements

Daily requirements for an adult are between 1.0 and 1.3mg (NRV: 1.1mg).

However, for optimal effect, vitamin B1 should be taken at much higher doses. To absorb larger amounts of vitamin B1, the necessary dosage is quite high; vitamin B1 is mainly absorbed via active transport, which is depleted after about 5 to 10mg of vitamin B1. Furthermore, at higher doses, only about 5% of total absorption is made via passive diffusion. A dose of 250mg thus corresponds to an actual intake of about 17 to 22mg of vitamin B1.

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: Vitamin B1 (in the form of Thiamine Hydrochloride).
Capsule shells: Hydroxypropyl Methylcellulose.
Contains: 100 capsules

Ingredients/Capsule % NRV*
Vitamin B1 250mg 22,727%

* Nutrient Reference Value

Per capsule: 250mg vitamin B1
In total: 25g vitamin B1/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) 15423019
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.

Laboratory Tests

The purity of our formulas is important to us. This is why we have both our raw ingredients as well as our finished products extensively tested by independent laboratories to confirm purity and active ingredient content. Here, we have provided the results of some of the tests carried out on this product.

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.

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