What is Vitamin B12 (B12 Vitamin)?

Vitamin B12 (cobalamin) is a water-soluble vitamin containing cobalt in its structure, which can only be produced by microorganisms. It acts as a cofactor in two fundamental enzymatic reactions: the conversion of homocysteine to methionine and the conversion of methylmalonyl-CoA to succinyl-CoA. Its absorption depends on the intrinsic factor of the stomach, and it is found naturally almost exclusively in animal-derived foods.

  • CAS number (main form): 68-19-9
  • Molecular formula: C₆₃H₈₈CoN₁₄O₁₄P
  • Forms in the catalog: Cyanocobalamin, Yuxing Biotech, Methylcobalamin, Yuxing Biotech, Cyanocobalamin, Sense

What is B12 Vitamin Used For? Why is it Used?

B12 has a wide range of EFSA-approved claims regarding the nervous system, red blood cell formation, and energy metabolism. Since it is found almost exclusively in animal foods, it is a critical supplement for vegans, the elderly, and groups with absorption disorders. While stable and economical cyanocobalamin is ideal for fortification and general use, methylcobalamin provides a directly usable active form cofactor for those who prefer active forms. High doses are safe because absorption is limited by the intrinsic factor.

Forms and Differences

Vitamin B12 is available in different chemical forms; the choice of form is made based on bioavailability, stability, and intended use:

  • Cyanocobalamin: The most commonly used synthetic form; it is very stable and economical, making it the preferred choice for fortification and most supplements. In the body, a cyanide group is released and it is converted into active forms (methyl- and adenosylcobalamin). According to NIH ODS, there is no significant difference in absorption rates between forms.
  • Methylcobalamin: The active cofactor form that can be used directly by the body (for methionine synthase). It functions as a methyl donor without requiring a conversion step; it is frequently used in sublingual and premium supplements.
  • Hydroxocobalamin / Adenosylcobalamin: Hydroxocobalamin is a natural form and stays in the tissues longer clinically (injection). Adenosylcobalamin is the second active cofactor form required for methylmalonyl-CoA mutase in the mitochondria.

Use in Dietary Supplements

  • Vegan and vegetarian nutrition: Since B12 is found naturally in animal foods, deficiency is common among vegans and those with largely plant-based diets; B12 supplementation or fortified food is mandatory for these groups.
  • Absorption in the elderly: In advanced age, absorption of food-bound (protein-bound) B12 is impaired due to atrophic gastritis and reduced stomach acid; these individuals benefit more from crystalline B12 (fortified food/supplement) forms.
  • Absorption disorders and drug interactions: Pernicious anemia (lack of intrinsic factor), stomach/intestinal surgery, and long-term use of metformin and proton pump inhibitors reduce absorption; high-dose oral or injection B12 may be required in these cases.
  • Form selection and high doses: Stable and economical cyanocobalamin is sufficient for most products; methylcobalamin is used for those who prefer the active form. Since absorption is limited by the intrinsic factor, high doses are considered safe.

Use in the Food Industry

  • Cyanocobalamin in fortification: Products such as breakfast cereals, plant-based beverages (soy/almond/oat milks), and nutritional yeast are usually fortified with cyanocobalamin; this is the primary reliable source for the vegan population.
  • Permitted sources and stability: The permitted B12 sources for fortification and supplements are cyanocobalamin and hydroxocobalamin (Annexes of EU 1925/2006 and the Turkish Regulation on Dietary Supplements). Cyanocobalamin is stable against heat and storage.

Effects on Health

Vitamin B12 plays a role in many fundamental functions in the body. The main functions authorized/evaluated by the European Food Safety Authority (EFSA):

  • Normal energy-yielding metabolism: B12 contributes to normal energy-yielding metabolism (EFSA approved).
  • Normal functioning of the nervous system: B12 contributes to the normal function of the nervous system (EFSA approved).
  • Homocysteine metabolism: B12 contributes to normal homocysteine metabolism (EFSA approved).
  • Red blood cell formation: B12 contributes to the normal formation of red blood cells (EFSA approved).
  • Psychological function and reduction of fatigue: B12 contributes to normal psychological function and contributes to the reduction of fatigue and exhaustion (EFSA approved).
  • Immunity and cell division: B12 contributes to the normal function of the immune system and the process of cell division (EFSA approved).

Usage Limits in Dietary Supplements

  • Nutrient Reference Value (NRV): NRV / Nutrient Reference Value: B12 is 2.5 µg (Annex XIII of EU 1169/2011).
  • Upper Tolerable Intake Level (EFSA): NO numerical Tolerable Upper Intake Level (UL) HAS BEEN ESTABLISHED for B12 (by both EFSA and the US FNB) — no upper limit has been derived as there is no evidence of adverse effects with high intake in healthy individuals. Excess is not absorbed since absorption is limited by the intrinsic factor.
  • Turkish legislation (TETGK): The permitted sources in the annexes of the TR Dietary Supplements Regulation are cyanocobalamin and hydroxocobalamin; for the daily maximum amount, B12 is marked with an asterisk (*) as 'not determined' in the Regulation annexes — no definitive upper number has been stated.

There is no numerical UL for B12. The clinically significant point is: high doses of folic acid can mask the hematological signs of B12 deficiency; therefore, evaluation of B12 status is recommended in folate supplementation.

Technical Specifications

ParameterValue
Purity97.0% - 102.0%
AppearanceDark red crystal or amorphous powder
Moisture≤5.0 %
SolubilityCompletely Soluble in Water

Scientific Studies

The following independent researches relate to the bioavailability, use, and effects of this vitamin (study types are specified):

Technical Documents and Supply — Asuka Kimya

You can contact Asuka Kimya for SDS, TDS, CoA and supply conditions for Vitamin B12.

References

  1. ods.od.nih.gov
  2. efsa.onlinelibrary.wiley.com
  3. eur-lex.europa.eu
  4. pubmed.ncbi.nlm.nih.gov
  5. pubmed.ncbi.nlm.nih.gov

The usage and health information on this page has been compiled from official legislation/institution sources (EFSA, NIH ODS, Turkish Food Codex, EUR-Lex) and independent scientific publications (PubMed). The product is a food supplement/food raw material and is not intended for the diagnosis or treatment of disease.