Lever
Lifestyle
- Regular monitoring of levels
- Addressing gastrointestinal health
- Reducing alcohol consumption
Blutwerte · Marker
Vitamin B12
Cobalamin · Cyanocobalamin · Methylcobalamin · B12
Vitamine & Nährstoffe
- Einheit:
- pmol/L
- Abbreviation
- B12
Vitamin B12 test quantifies the level of cobalamin in the blood, reflecting its availability for biological processes.
Reference Ranges
Reference
148–740pmol/L
148
300
600
740
LowNormalHigh
Reference
Optimal
Unit · pmol/LRanges may vary slightly by lab; age and sex differences are minimal.
Overview
Übersicht
Vitamin B12, also known as cobalamin, is a water-soluble vitamin essential for various biological functions, including DNA synthesis, red blood cell formation, and neurological function. It is unique among vitamins due to its complex absorption pathway, which involves the stomach, small intestine, and specific binding proteins. Clinically, vitamin B12 is crucial for preventing megaloblastic anemia, a condition characterized by ineffective red blood cell production. Deficiency can also lead to neurological issues, including cognitive impairment and psychosis, due to its role in myelin synthesis and neurotransmitter metabolism. In the context of athletic performance and biohacking, maintaining optimal B12 levels is important for energy metabolism and cognitive function. Athletes may focus on B12 to support red blood cell production and oxygen transport, potentially enhancing endurance. Biohackers might target B12 for its role in cognitive enhancement and neuroprotection. However, testing for B12 levels can be influenced by factors such as recent dietary intake, genetic variations affecting absorption, and interactions with other nutrients like folate. Researchers have found that fasting is not required for accurate B12 measurement, but consistent testing conditions are recommended to ensure comparability.
Klinische Bedeutung
Reduced B12 levels indicate potential deficiencies leading to anemia and neurological disorders. Elevated levels are rare but may suggest liver disease or supplementation excess.
Dynamics
Trend Interpretation
Rising Values
Progressively rising B12 levels may suggest excessive supplementation or liver dysfunction. Re-test in 3 months if levels exceed optimal range.
Falling Values
Falling B12 levels indicate potential malabsorption or dietary insufficiency, warranting further investigation.
Re-test Interval
6 months if outside optimal range
Etiology
Causes — High & Low
Cause
Elevated Levels
- Liver disease
- Excessive supplementation
- Leukemia
- Renal failure
- Hepatitis
Cause
Low Levels
- Malabsorption syndromes
- Pernicious anemia
- Vegan diet
- Gastrointestinal surgery
- Chronic alcoholism
Protocol
How to Optimize
Lever
Nutrition
- Incorporating animal products like meat and dairy
- Fortified cereals
- Nutritional yeast
Lever
Supplementation
- Cyanocobalamin
- Methylcobalamin
- Hydroxocobalamin
Note:
Consult a healthcare provider before starting supplementation, especially if you have absorption issues.
Testing Guidelines
✓Fasting Not Required
✓Not Time-Sensitive
Testing Frequency
Annually for at-risk populations, every 6 months if previously deficient
Interfering Factors
- Recent supplementation
- Certain medications
- Genetic polymorphisms
Related Peptides & Hormones
Folate
hormone or peptideCorrelated with
Open Research Questions
Current research suggests that the relationship between vitamin B12 levels and conditions such as autism spectrum disorder remains inconclusive, with inconsistent findings across studies and a lack of longitudinal data to account for individual variability. Researchers have not yet established optimal reference ranges or targets for B12 levels in various populations, particularly in pregnant women and children. Unanswered clinical questions include the precise mechanisms linking B12 deficiency to neurodevelopmental outcomes and the impact of dietary intake on B12 status.
20 Research Publications
686
Total Citations
2
Human/RCT
3.0
Avg. Influence
2025
Latest
Sort
Filter
01Top
#01
How I treat anemia in pregnancy: iron, cobalamin, and folate.
ReviewInfluence7.0
174
This study discussed the prevalence of anemia in pregnancy, identifying vitamin B12 deficiency as a rising concern. Researchers noted that low maternal B12 levels could be linked to adverse fetal outcomes, highlighting the need for awareness and management of B12 status during pregnancy.
02Top
#02
Vitamin B12 status in health and disease: a critical review. Diagnosis of deficiency and insufficiency - clinical and laboratory pitfalls.
ReviewInfluence5.0
150
This critical review focused on the complexities of diagnosing vitamin B12 deficiency, emphasizing that it can present as various health issues. Researchers found that the sensitivity and specificity of tests for B12 status can be affected by multiple factors, complicating diagnosis and treatment.
03Top
#03
Severe megaloblastic anemia: Vitamin deficiency and other causes.
ReviewInfluence5.0
98
Researchers found that megaloblastic anemia is primarily caused by vitamin B12 and folate deficiencies, leading to ineffective red blood cell production. This study examined the diagnostic criteria for megaloblastic anemia and emphasized the importance of identifying the underlying causes for effective treatment.
04
#04
Laboratory testing for cobalamin deficiency in megaloblastic anemia.
ReviewInfluence2.0
71
This study focused on laboratory testing for cobalamin deficiency in megaloblastic anemia. Researchers found that traditional serum cobalamin tests may not accurately reflect vitamin B12 status, suggesting the need for alternative biomarkers to improve diagnostic accuracy.
05
#05
Omeprazole and vitamin B12 deficiency.
ReviewInfluence1.0
45
This study examined the impact of omeprazole on vitamin B12 absorption, finding that it may hinder the release of B12 from dietary proteins. Researchers noted the need for further clinical trials to assess the long-term significance of this interaction and its implications for patient care.
06
#06
Vitamin B12 deficiency.
ReviewInfluence1.0
38
This study examined vitamin B12 deficiency, highlighting its complex absorption process and various causes, including malabsorption and dietary limitations. Researchers found that B12 deficiency can affect multiple organ systems, particularly the blood and nervous system, leading to conditions like megaloblastic anemia and cognitive impairments. The study emphasizes the importance of laboratory testing for accurate diagnosis.
07
#07
Vitamin B12 deficiency and metabolism-mediated thrombotic microangiopathy (MM-TMA).
ReviewInfluence2.0
38
Researchers examined the relationship between vitamin B12 deficiency and thrombotic microangiopathy (TMA). They found that severe B12 deficiency can mimic TMA symptoms, highlighting the importance of prompt identification and treatment of B12 deficiency.
08
#08
[Vitamin B12 (cobalamin)].
ReviewInfluence2.0
29
This study reviewed the clinical significance of vitamin B12 deficiency, highlighting its association with megaloblastic anemia and neurological disorders. Researchers discussed the biochemical parameters used to diagnose both clinical and subclinical deficiency.
09
#09
The application and interpretation of laboratory biomarkers for the evaluation of vitamin B12 status.
Harrington Dominic J, et al. · Annals of clinical biochemistry · 2025
ReviewInfluence2.0
22
Researchers examined various biomarkers for assessing vitamin B12 status, noting that no single test is definitive. The study highlighted the importance of using a combination of biomarkers to improve diagnostic accuracy and address the uncertainties surrounding B12 deficiency.
Key findings
- 01Researchers observed that different biomarkers can indicate vitamin B12 deficiency or sufficiency.
- 02The review identified the significance of accurate interpretation of test results for proper health assessments.
- 03Researchers noted that understanding these biomarkers is crucial for preventing potential health issues related to vitamin B12 status.
10
#10
Vitamin B12 and Autism Spectrum Disorder: A Review of Current Evidence.
Review
11
Researchers reviewed the role of vitamin B12 in neurodevelopment, particularly its importance during pregnancy and early childhood. The study found that low maternal B12 levels may affect fetal brain development and contribute to cognitive and behavioral issues, including autism spectrum disorder.
Clinical Trials (4)
4
Total Trials
282
Total Enrolled
Effects of Vitamin B12 and Natural Orange Extract, and Their Combination on Physical and Mental Performance
NCT07341789ENROLLING_BY_INVITATION
Sponsor
Francisco Javier Martínez Noguera
Enrollment
20
Started
2025
Primary outcome
Wingate test
Vitamin b12Supplementation During Endurance PerformanceFlavonoidsMental FatigueBiomarker Feedback
Vitamin B12 Dose Escalation Trial in Pregnancy
Sponsor
George Washington University
Enrollment
50
Started
2023
Primary outcome
Assessing the steady state pharmacokinetics of B12 upon oral administration in pregnant women.
Vitamin B 12 Deficiency
Vitamin B12 Supplementation to Improve B12 Status and Child Development
NCT03258385COMPLETED
Sponsor
International Centre for Diarrhoeal Disease Research, Bangladesh
Enrollment
155
Started
2017
Primary outcome
Change in concentrations of biomarkers of vitamin B12 in mother-child pairs
Early Pregnancy
Vitamin B12 Status and Response to Vitamin B12 Supplementation in Patients With Parkinson's Disease
Sponsor
Emory University
Enrollment
57
Started
2006
Primary outcome
Vitamin B12 concentration
Parkinson's Disease
Publication Trend
Research publications about Vitamin B12 over time
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