Vitamin B12
MH3A® Formula


Each lozenge offers 1,000µg of vitamin B12 from our MH3A® formula (providing a total of five B12 active ingredients). Sublingual administration for optimal absorption. Natural guar gum lozenges, no artificial additives. Non GMO. 100% vegan. Made in the EU. 2x180 lozenges
  • MH3A® formula: a harmonious blend of 5 different active ingredients of B12
  • Bioactive vitamin B12 in the form of methylcobalamin, hydroxocobalamin and adenosylcobalamin
  • All 3 natural forms of vitamin B12, plus 2 active coenzyme forms with high bioavailability
  • High-dose B12: 1,000µg of bioactive vitamin B12 per tablet
  • Lozenges are ideal for sublingual administration (direct absorption through the mucous membrane of the mouth)
  • Fast and direct absorption into the bloodstream, avoiding potential absorption difficulties in the gut
  • Natural guar gum lozenges (non GMO)
  • Vitamin B12 supports homocysteine metabolism, mental function, the immune system and the reduction of tiredness and fatigue
  • Vitamin B12 contributes to energy metabolism, the nervous system, erythropoiesis and cell division
Customize Vitamin B12<br>MH3A® Formula<br>1,000<span class="protect-case">µg</span>
2 x Vitamin B12 MH3A® Formula 1,000µg   + €0.00

* Required Fields

€26.41 €27.80

Delivery : 1–3 business days

Incl. VAT, excl. Shipping

€366.81 / 1kg

Premium Bioactive Ingredients

  • MH3A® formula: bioactive vitamin B12 in the form of methylcobalamin, hydroxocobalamin and adenosylcobalamin
  • High-dose B12: 1,000µg per tablet
  • All 3 natural forms of vitamin B12
  • Plus: 2 active coenzyme forms with high bioavailability
  • Total of 5 different active ingredients of B12
  • Premium active ingredients from the EU
    100% naturally sourced
  • Lozenges are ideal for sublingual administration (direct absorption through the mucous membrane of the mouth)
  • Fast and direct absorption into the bloodstream, avoiding potential absorption difficulties in the gut
  • Natural guar gum lozenges (non GMO)

How are we different?

Not all forms of vitamin B12 show the same level of efficacy. Conventional supplements often contain only synthetic forms of vitamin B12, which must first be converted into biologically active forms by the body before they can be utilised. Sunday Natural Vitamin B12 MH3A® provides the full spectrum of natural and bioactive forms of vitamin B12.

Conventional vitamin B12 supplements usually contain only one active ingredient. However, several active forms of B12 occur in our bodies and in natural foods. All forms exhibit different effects and are metabolised in part via different pathways, resulting in absorption rates unique to every individual.

Although standard practice to supply vitamin B12 in an isolated, synthetic context, our pioneering MH3A® formula offers the vitamin in the same way as it occurs in food: as a mixture of all three natural and bioactive forms, which allows the natural synergistic effects between them to occur (they each fulfil completely different tasks in the body and have different focal points of action). Our MH3A® formula contains these three forms of vitamin B12 in an equal ratio, spread across a total of five active forms of B12. This formula thus provides a foundational supply of vitamin B12 as found in nature, where all three forms are always found in a harmonious combination, both in our bodies and in the foods we eat. In contrast, the majority of products available on the market contain only one of the three B12 active ingredients: either methylcobalamin, hydroxocobalamin or adenosylcobalamin.

The advantage of lozenges is their ability to be directly absorbed through the mucous membrane of the mouth by means of passive diffusion. The citamins can then enter the bloodstream directly, without first passing through the liver—as would be the case with intestinal absorption. As a result, any potential digestive difficulties in the gut can be completely avoided, significantly increasing bioavailability.

Our high-quality lozenges are based on non-GMO guar gum, allowing us to completely omit the controversial yet common additives in conventional lozenges, including magnesium stearate, sweeteners, colourings and animal products such as gelatine.


  • 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 B12 (Cobalamin)

Vitamin B12 performs a variety of important functions in the body: it can help to reduce tiredness and fatigue and to maintain normal energy metabolism, it contributes to the normal functioning of the psyche as well as the immune and nervous systems, it plays a role in the formation of red blood cells (also known as erythropoiesis) and it supports normal homocysteine metabolism, as well as being required in the process of cell division. Vitamin B12 also acts as a coenzyme in the body. This means that certain enzymes in our body require B12 in order to fulfil their tasks. In other words, many enzymatic reactions are directly dependent on vitamin B12 and cannot take place without it.

Vitamin B12 MH3A® Formula

Vitamin B12 (cobalamin) occurs in a variety of different chemical structures, all of which perform different tasks in the body. The natural forms of vitamin B12, which can exert a direct effect on the body, are considered bioactive coenzymes. Synthetic forms of vitamin B12, such as cyanocobalamin, must first be converted into a natural form by the body in order to be effective.

Methylcobalamin and adenosylcobalamin are the bioactive coenzyme forms of vitamin B12. Because they each have different areas of action and take part in completely different reactions, the body is able to convert these forms from one to the other. Methylcobalamin plays a role in the methylation cycle within the cell plasma, a far-reaching function influencing various body processes from blood cell synthesis to the functioning of the nervous system. Adenosylcobalamin, on the other hand, takes effect in the mitochondria, the powerhouse of the cell. There it plays a role in the citrate cycle, the central metabolic cycle for energy production. The third natural form of vitamin B12 is hydroxocobalamin, a form which can be found in many foods. It makes up a significant amount of the total B12 in the blood and binds particularly well to vitamin B12 transport molecules. It is thus not excreted as quickly; hydroxocobalamin is the form of B12 with the highest capacity for building long-term stores in the body and can be easily converted into either of the two active coenzyme forms as needed.

Hydroxocobalamin is another natural form of vitamin B12 found in many foods. A significant portion of vitamin B12 in the bloodstream exists as hydroxocobalamin. Hydroxocobalamin has a strong affinity for vitamin B12 transport molecules, leading to slower elimination. This makes it the B12 form with the best depot properties.

Health Benefits of Vitamin B12

According to the European Food Safety Authority (EFSA), vitamin B12 contributes to:

  • Normal energy metabolism
  • Normal nervous system functioning
  • Normal homocysteine metabolism
  • Normal cognitive function
  • Normal erythropoiesis
  • Normal immune system functioning
  • The reduction of tiredness and fatigue
  • Cell division


Recommended Dosage

Take 1 lozenge (1,000µg B12) daily. Allow to dissolve in the mouth and drink plenty of water.

We recommend placing the lozenge under the tongue or in the cheek and allowing it to dissolve for as long as possible without swallowing.

Daily Requirements

The German Nutrition Society (DGE) recommends a minimum intake of 3µg vitamin B12 per day for adults.

B12 Intake

The human body can only absorb a portion of the vitamin B12 found in food and supplements: only about 1–2µg of vitamin B12 can be absorbed at a time via the intrinsic factor, a special protein, with a further 1% absorbed via passive diffusion through the intestine. Calculating total B12 absorption therefore requires taking both of these factors into account. Note: By distributing intake of B12 throughout the day, absorption via the intrinsic factor can be maximised.

In the case of Sunday Natural MH3A® 1,000µg, intake can be estimated at 10 to 12µg of vitamin B12 per lozenge.

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: Guar Gum*, Vitamin B12 (Methylcobalamin, Hydroxocobalamin, Adenosylcobalamin).
* cultivated without the use of plant protection products
Contains: 180 tablets

Ingredients/Lozenge % NRV**
Vitamin B12 1,000µg 40,000%
Methylcobalamin 333µg 13,333%
Hydroxocobalamin 333µg 13,333%
Adenosylcobalamin 333µg 13,333%

** Nutrient Reference Value

Per tablet: 1,000µg B12
Per jar: 180,000µg B12


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) 16604013
Origin All ingredients from the EU
Production In-house production in Europe, bottling and encapsulation in the EU according to HACCP, GMP and ISO 22000:2018 standards
Finished products packaged in amber glass jars and stored in non-toxic containers
Shipping in mineral oil-free boxes
Capsules Vegan, guar gum as a natural, prebiotic filler. 100% free from carrageenan, PEG, magnesium stearate and other additives.
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.

The image could not be loaded.