rubyni® Vitamin B12
Vegan Vitamin B12 from Shiitake Mushrooms
Dietary supplement with vitamin B12 from organic shiitake mushroom extract, 100% vegan, gluten- and lactose-free, 100% organic.
Ingredients: Organic wheatgrass powder (from Triticum aestivum), coating agent hydroxypropyl methylcellulose (plant-based capsule shell), organic shiitake extract (from Lentinula edodes, 0.1% vitamin B12)
One capsule contains 2.5 μg of vitamin B12—which is 100% of the daily value according to the NRV*.
*NRV = nutrient reference value (for adults according to the Food Information Regulation (LMIV))
Recommended Use: Take one capsule per day with sufficient liquid, without chewing. Do not exceed the recommended daily intake.
60 capsules €59.90
Includes sales tax; shipping not included
Vitamin B12 from a natural source
For our rubyni Vitamin B12, we use a purely vegan raw material: The capsules contain an extract from organic shiitake mushrooms. Shiitake mushrooms can naturally contain vitamin B12.1
Vitamin B12 plays a role in numerous metabolic processes. For example, it contributes to the normal formation of red blood cells and to normal energy metabolism.2
- Vegan Vitamin B12 from Shiitake Mushrooms
- One capsule contains 2.5 µg of vitamin B12
- vegan, lactose- and gluten-free
- 100% organic
- No added preservatives
How much vitamin B12 does your body need?
Since the human body cannot produce vitamin B12 on its own, this vitamin must be obtained regularly through the diet. In nature, it is produced by microorganisms and is usually found in significant amounts only in animal-based foods such as meat, fish, eggs, and dairy products.3
But how much of this micronutrient does your body need per day? The German Nutrition Society (DGE) recommends an estimated daily intake of 4 micrograms (µg) of vitamin B12 for both men and women. Pregnant and breastfeeding women have a higher requirement.
The value set by the European Union (EU) is lower than that of the DGE and stands at 2.5 µg of vitamin B12 per day. This value is known as the Nutrient Reference Value (NRV for short). In the production of dietary supplements, it serves as a guideline for the labeling of vitamins and minerals. 4,5
When might it be a good idea to take a vitamin B12 supplement?
People who follow a vegan diet consume very little or no vitamin B12 from natural foods. Even with a vegetarian diet, vitamin B12 intake depends on the types and amounts of foods consumed.3 In these cases, taking a dietary supplement to increase vitamin B12 intake may be considered.
Even in older age, ensuring an adequate intake of this micronutrient may require special attention. This is because, as we age, the physiological processes involved in the absorption of vitamin B12 can change.6
In addition, individual factors can also influence vitamin B12 intake.3
rubyni® Vitamin B12 – What’s in Our Capsules
One rubyni Vitamin B12 capsule provides you with 2.5 µg of vitamin B12—that’s 100% of the NRV*. We recommend that adults take one capsule per day, whole and with plenty of liquid, if there is reason to believe that their dietary intake of B12 is insufficient.
*NRV = nutrient reference value (for adults according to the Food Information Regulation (LMIV))
Note: Food supplements should not be used as a substitute for a balanced and varied diet or to replace a healthy lifestyle.
rubyni® Vitamin B12 at a Glance
rubyni Vitamin B12 is a dietary supplement that contains vitamin B12 from a vegan source. We use the shiitake mushroom (Lentinula edodes)—which many people know as a tasty edible mushroom used in Asian dishes—as the raw material for our capsules. The vitamin B12 is extracted from the mushrooms through a multi-step process.
The shiitake mushrooms we use for rubyni Vitamin B12 come from northeastern India. They are grown on logs using traditional methods and are 100% organic.
Our product is rounded out with wheatgrass powder (Triticum aestivum) from EU organic farms. It consists of 100% fresh wheatgrass, which is gently cleaned, cut to size, air-dried, and then finely ground.
Good to know:
Vitamin B12: A Nutrient Essential for Numerous Bodily Functions
Vitamin B12 is water-soluble. Unlike many other water-soluble vitamins, your body can store it for a certain period of time—particularly in the liver. It can draw on these stores as needed for various metabolic processes.7 For example, vitamin B12 contributes to the normal functioning of the nervous system and supports normal mental function.2
However, its role in energy metabolism is somewhat better known: Vitamin B12 contributes to normal energy metabolism and helps reduce tiredness and fatigue. It also supports the formation of red blood cells. These blood cells supply tissues with oxygen, which is necessary for normal energy production in the body’s cells.2,8
What exactly is the “intrinsic factor”?
In order for your body to absorb vitamin B12 from food, it needs what is known as the “intrinsic factor.” This is a protein produced naturally by the body, specifically by a healthy stomach lining. It binds to vitamin B12 and aids in its absorption in the intestines.9
What role does vitamin B12 play in the body (Health Claims)?
Vitamin B12 plays a role in various bodily functions:
Vitamin B12
- contributes to normal energy metabolism
- contributes to the normal function of the nervous system
- contributes to normal homocysteine metabolism
- Contributes to normal mental function
- contributes to the normal formation of red blood cells
- contributes to the normal function of the immune system
- contributes to the reduction of tiredness and fatigue
- has a function in cell division
What makes rubyni Vitamin B12 so special?
Vitamin B12 is found naturally primarily in animal-based foods. For our capsules, we use a vegan source: the vitamin B12 comes from shiitake mushrooms that are grown on logs using traditional, 100% organic farming methods. rubyni Vitamin B12 also contains organic wheatgrass powder.
How much Rubyni Vitamin B12 should I take each day?
For adults, we recommend taking one capsule daily with sufficient liquid, without chewing it. One capsule contains 2.5 μg of vitamin B12—which corresponds to 100% of the so-called nutrient reference value for adults as defined by the Food Information Regulation. Do not exceed the recommended daily intake.
Is Rubyni Vitamin B12 vegan, gluten-free, and lactose-free?
Yes, we use purely vegan sources for our rubyni B12: The raw material we use is shiitake mushrooms from northeastern India. These are organic—as is the wheatgrass powder included in the product. The capsule coating is plant-based. The product is therefore 100% vegan. It is also gluten-free and lactose-free.
Which foods contain vitamin B12?
Naturally, this micronutrient is found primarily in animal-based foods such as dairy products, eggs, fish, and meat. For people who follow a vegetarian or vegan diet, it can therefore be difficultto meet their needs through diet alone.³ In these cases, taking a vitamin B12 supplement may be advisable.
What role does vitamin B12 play in energy metabolism?
Vitamin B12 plays a role in various bodily functions. For example, it contributes to normal energy metabolism and helps reduce tiredness and fatigue. It also plays a role in the formation of red blood cells, which transport oxygen to the body’s cells.2
References:
1) Federal Institute for Risk Assessment. Vitamin B12 – Pay Special Attention to Adequate Intake in a Plant-Based Diet. As of October 18, 2023. Vitamin B12 – Pay Special Attention to Adequate Intake in a Plant-Based Diet, last accessed on July 6, 2026
2) Commission Regulation (EU) No. 432/2012 of May 16, 2012, establishing a list of permitted other health claims made on foods, other than those referring to the reduction of disease risk and to children’s development and health. As of August 20, 2025. https://eur-lex.europa.eu/legal-content/DE/TXT/?uri=CELEX%3A02012R0432-20250820, last accessed on July 6, 2026
3) German Nutrition Society (DGE). Selected Questions and Answers on Vitamin B12. As of 2018. https://www.dge.de/gesunde-ernaehrung/faq/vitamin-b12/, last accessed on June 7, 2026
4) Regulation (EU) No. 1169/2011 of the European Parliament and of the Council of October 25, 2011. https://eur-lex.europa.eu/legal-content/DE/TXT/PDF/?uri=CELEX:32011R1169&from=EN, last accessed on July 6, 2026
5) German Food Association. Legal Regulations for Dietary Supplements. https://www.lebensmittelverband.de/de/lebensmittel/nahrungsergaenzungsmittel/nem-gesetzliche-regelungen, last accessed on July 6, 2026
6) Ernährungs-Umschau. Vitamin B12 Deficiency in Older Adults. https://ernaehrungs-umschau.de/download/vitamin-b12-mangel-im-hoeheren-lebensalter/, last accessed on July 6, 2026
7) NetDoktor. Vitamin B12. As of December 4, 2024. https://www.netdoktor.de/laborwerte/vitamin-b12/, last accessed on July 6, 2026
8) German Red Cross. Red Blood Cells—The Body’s Supercells. As of April 24, 2025. https://www.blutspende.de/magazin/von-a-bis-0/erythrozyten-superzelle-des-koerpers, last accessed on July 6, 2026
9) DocCheck Flexikon. Intrinsic Factor. As of September 24, 2025. https://flexikon.doccheck.com/de/Intrinsic_Factor, last accessed July 6, 2026
Convinced by rubyni®
EXPERIENCES THAT BUILD TRUST
Tobias Angerer
Cross-country skier
As a former professional athlete and health-conscious person, my physical performance and well-being are extremely important to me. That's why I take rubyni® with elderberries - it's now part of my daily routine. I am convinced of the positive effects of elderberries on my immune system, my energy levels and my fitness, especially during regeneration after periods of exertion.
Andrea Sokol
Phytotherapist | Nutrition and health consultant
I work as a nutrition and health consultant and am a trained phytotherapist. Transparency, sustainability and quality are very important to me. And I have to say that rubyni® has completely won me over as a brand. The capsules contain only extremely high-quality and natural ingredients whose effectiveness has been proven by studies and which provide the body with important nutrients. I have published several videos about my personal rubyni® journey on my YouTube channel Ohlala & Solala. There I tell you even more about what makes this dietary supplement so special from my point of view.
Hanna Kebinger
Biathlete
As a biathlete, I have to be fit and able to perform at the drop of a hat. I had big problems with that in the past. My body was repeatedly weakened and I had to put up with many setbacks. When I was looking for a solution to support my immune system in the long term, my naturopath introduced me to elderberries as a superfood, among other things. I now take rubyni® with elderberries every day. The capsules are also super handy when I'm on the World Cup circuit. Rubyni® is a valuable aid for me during stressful competition phases and my immune system is finally back on top form.
Prof. Dr. rer. nat. Michaela Döll