Vitamin B12 / Risk Cancer Research Results

VitB12, Vitamin B12: Click to Expand ⟱

Features:

Vitamin B12 = cobalamin (water-soluble vitamin; forms: methylcobalamin, adenosylcobalamin, cyanocobalamin, hydroxocobalamin). Sources: animal-derived foods; requires intrinsic factor–mediated absorption; transport via transcobalamin (TCII). Primary mechanisms (ranked):
1) Methionine synthase cofactor → homocysteine → methionine → SAM → DNA/RNA/histone methylation (one-carbon metabolism integration).
2) Methylmalonyl-CoA mutase cofactor → odd-chain FA / branched-chain AA metabolism; mitochondrial anaplerosis support.
3) Genome stability support (via nucleotide synthesis + methylation balance).
Bioavailability/PK relevance: Active absorption saturable (~1–2 µg/meal via IF); passive diffusion at high oral doses (~1%); serum levels tightly regulated; intracellular utilization depends on TCII uptake and lysosomal processing.
In-vitro vs oral exposure: Most cancer cell studies use supraphysiologic cobalamin or manipulate one-carbon flux; effects typically reflect methylation / nucleotide synthesis dependency rather than direct cytotoxicity.
Clinical evidence status: Essential nutrient; deficiency correction clearly beneficial; no established anticancer efficacy; epidemiology mixed (very high serum B12 sometimes correlates with cancer presence—likely reverse causality/biomarker phenomenon rather than causation).

Helps make red blood cells, metabolize food and prevent nerve damage.

Vitamin B12 (Cobalamin) — Cancer vs Normal Pathway Effects

Rank	Pathway / Axis	Cancer Cells (↑ / ↓ / ↔)	Normal Cells (↑ / ↓ / ↔)	TSF	Primary Effect	Notes / Interpretation
1	One-carbon metabolism (Methionine synthase → SAM)	↑ methylation capacity; ↑ nucleotide synthesis (proliferation support)	↑ genome stability; ↑ normal DNA synthesis	R→G	Methyl donor cycling	Supports SAM production; in rapidly dividing tumors may facilitate growth if not limiting.
2	DNA methylation / Epigenetics	↔ / ↑ (context-dependent; can restore normal methylation if deficient)	↑ methylation homeostasis	G	Epigenetic stability	Deficiency → hypomethylation/genomic instability; supplementation restores baseline rather than inducing supraphysiologic hypermethylation in most settings.
3	Nucleotide synthesis (via folate cycle coupling)	↑ proliferation support (if B12 limiting)	↑ normal hematopoiesis	R→G	DNA replication capacity	Mechanistically linked to folate; deficiency leads to megaloblastic anemia.
4	Mitochondrial metabolism (Methylmalonyl-CoA mutase)	↔ (supports baseline metabolism)	↑ mitochondrial function	R	Anaplerotic support	Prevents methylmalonic acid accumulation; preserves mitochondrial efficiency.
5	ROS	↔ (indirect)	↓ oxidative stress (deficiency correction)	R	Redox balance (secondary)	Effects mediated through improved mitochondrial and methylation balance.
6	NRF2	↔ (no direct axis)	↔	G	Adaptive response (indirect)	No primary NRF2-targeting activity established.
7	Ca²⁺	↔	↔	P	Not a core pathway	No meaningful Ca²⁺ modulation axis.
8	HIF-1α / Warburg	↔ (indirect via proliferation capacity)	↔	G	Metabolic permissiveness	No direct hypoxia pathway targeting; effects are permissive rather than suppressive.
9	Ferroptosis	↔	↔	R	Not established	No defined ferroptotic mechanism.
10	Clinical Translation Constraint	Essential nutrient; correction of deficiency critical. No validated anticancer benefit; very high serum B12 often reflects disease state rather than supplementation causality.		—	Evidence	Interpret epidemiologic associations cautiously (reverse causation common).

TSF legend: P: 0–30 min | R: 30 min–3 hr | G: >3 hr

Risk, Risk: Click to Expand ⟱

Source:

Type:

Risk: by definition reduces risk of disease or cancer.
Down Target direction of risk indicates lower cancer risk.
ChemoPreventive also mean lower cancer risk. But for Chemopreventive an up arrow indicates more preventive.

Cancer Risk Impact Score (CRIS)
CRIS scale:
–5 = very strong risk reduction
–4 = strong risk reduction
–3 = moderate risk reduction
–2 = modest risk reduction
–1 = weak / context-dependent
0 = neutral


CRIS  Exposure / Compound  Evidence  Cancers  Notes


-5  Exercise (overall)
VStrong Hum  BC, CRC, Endo, PCa, Liv
↓insulin/IGF-1, ↓inflammation, ↑immune surveillance, ↓hormones



-5  Aerobic + resistance  VStrong Hum  Broad inc + mort
Best overall exercise synergy



-4  Aerobic exercise (mod–vig)  VStrong Hum  BC, CRC, Endo
Dose–response; ↓visceral fat



-4  Resistance training (alone)  Strong Hum  BC, CRC
↑insulin sensitivity; ↑lean mass



-3  High-intensity interval training  Mod–Strong Hum  BC, CRC
↑AMPK; ↑mitochondrial function; adherence matters



-2  NEAT / low-intensity activity  Moderate Hum  CRC
↓sedentary harm



-5  Cruciferous vegetable pattern  Strong Hum  Lung, CRC, BC, PCa
↑NRF2, ↓CYP1; ITC synergy



-5  Sunlight exposure (physiologic)  Strong Hum  CRC, BC, PCa
↑circadian alignment, ↑immune effects beyond vitamin D



-4  Fasting (metabolic pattern)
Strong Mech + Hum  BC, CRC, PCa 
↓IGF-1, ↓mTOR, ↑autophagy



-4  Curcumin
Hum + Pre  GI, BC, PCa
↓NF-κB, ↓STAT3



-4  Sulforaphane
Hum + Pre  Lung, CRC, BC
↑NRF2, ↓HDAC



-4  PEITC
Hum + Pre  Lung, CRC, PCa
↓CYP1A2, ↑apoptosis



-4  EGCG (tea matrix)
Strong Hum  GI, PCa, BC
↓angiogenesis; tea matrix superior to extract



-4  Lycopene
Strong Hum  PCa
↓oxidative DNA damage



-4  Apigenin
Pre + Diet Hum  BC, PCa, CRC 
↓PI3K-AKT, ↑p53



-4  Luteolin
Pre + Diet Hum  Lung, CRC, BC 
↓STAT3, ↓EMT



-4  Kaempferol
Diet Hum  Ov, Panc, Lung
↓VEGF, ↑apoptosis



-4  Fisetin
Pre + Early Hum  CRC, PCa, Mel
↓mTOR; senolytic activity



-4  Ellagic acid → Urolithin A
Hum (microbiome)  CRC, PCa, BC
↑mitophagy, ↓ER/AR signaling



-3  Omega-3 (EPA/DHA)
Strong Hum  CRC, BC
↓inflammation, ↓COX-2



-3  Vitamin D3 (supp)
Obs + RCT  CRC, BC
U-shaped response; ↓proliferation



-3  Garlic (allicin)
Mod Hum  GI
↓inflammation, ↓H. pylori



-3  Mushroom beta-glucans
Hum adjunct  GI, BC
↑NK cells, ↑immune surveillance



-3  Melatonin
Hum + Mech  BC, PCa
↓estrogen signaling, ↑circadian regulation



-3  Coffee (whole)
Strong Hum  Liv, Endo
↓fibrosis, ↓inflammation



-2  Quercetin
Limited Hum  Lung, CRC
Senolytic; ↓PI3K signaling



-2  Resveratrol
Limited Hum  CRC, BC
↓NF-κB; low bioavailability



-2  I3C / DIM
Mod Hum  BC, Cerv
↑2-OH estrogen, ↓ER signaling



-2  Thymoquinone
Early Hum  BC, CRC
↑apoptosis, ↓NF-κB



-2  Beta-carotene (food)
Hum  Lung
Antioxidant only in whole-food context



-1  Vitamin K2 (MK-4/7)
Limited Hum  Liv, PCa
↓proliferation, ↑differentiation



-1  Boron
Obs  PCa, Lung
↓inflammation; hormone modulation



0  Vitamin C (oral)
Strong Hum  —
Neutral overall effect



0  Genistein (soy)
Strong Hum  BC, PCa
Timing-dependent effects



0  Selenium (diet)
Mixed Hum  PCa
Narrow therapeutic window



0  Capsaicin
Mixed  Gastric
Dose-dependent effects



+2  Vitamin E (alpha only)
Strong RCT  PCa
Increased risk signal



+2  Green tea extract (high-dose)
Case reports  Liv
Hepatotoxicity reported



+4  Beta-carotene (supplement)
Strong RCT  Lung (smokers)
Increased lung cancer risk in smokers



+5  Alcohol (ethanol)
Strong Hum  BC, Liv, Eso
Linear increase in cancer risk




Evidence
Hum        human data
VStrong    very strong
Strong     strong
Mod        moderate
Obs        observational
Pre        preclinical
RCT        randomized controlled trial
Mech       mechanistic
Adjunct    adjunct clinical use

Scientific Papers found: Click to Expand⟱

2173-

FA,

VitB12,

Elevated serum homocysteine levels associated with poor recurrence-free and overall survival in patients with colorectal cancer

Study,

CRC,

Risk↓, eff↝, eff↝, homoC↓,

4056-

VitB12,

VitB6,

FA,

Vitamin B12, B6, or Folate and Cognitive Function in Community-Dwelling Older Adults: A Systematic Review and Meta-Analysis

Review,

AD,

*Risk∅, *cognitive↑, *cognitive∅,

4057-

VitB6,

VitB12,

FA,

Folate, Vitamin B6 and Vitamin B12 Intake and Mild Cognitive Impairment and Probable Dementia in the Women’s Health Initiative Memory Study

Study,

AD,

Postmenopausal women (n=7,030)

*Risk↓, *Risk∅,

4062-

VitB6,

FA,

VitB12,

Vitamin B6, B9, and B12 Intakes and Cognitive Performance in Elders: National Health and Nutrition Examination Survey, 2011–2014

Study,

AD,

2421 participant

*Risk↓, *Risk↓, *Risk↓, *cognitive↑,

4077-

VitB6,

FA,

VitB12,

VitD3,

VitE

Vitamin Supplementation as an Adjuvant Treatment for Alzheimer’s Disease

Review,

AD,

*antiOx↑, *cognitive↑, *homoC↓, *Risk↓, *Risk↓, *Risk↓, *other↝, *Dose↝, *Risk↓, *Risk↓,

Showing Research Papers: 1 to 5 of 5

* indicates research on normal cells as opposed to diseased cells
Total Research Paper Matches: 5

Pathway results for Effect on Cancer / Diseased Cells:

Core Metabolism/Glycolysis ⓘ

homoC↓, 1,

Drug Metabolism & Resistance ⓘ

eff↝, 2,

Functional Outcomes ⓘ

Risk↓, 1,
Total Targets: 3

Pathway results for Effect on Normal Cells:

Functional Outcomes ⓘ

cognitive↑, 3, cognitive∅, 1, Risk↓, 9, Risk∅, 2,
Total Targets: 8

Scientific Paper Hit Count for: Risk, Risk

5 Folic Acid, Vit B9
5 Vitamin B12
4 Vitamin B6,pyridoxine
1 Vitamin D3
1 Vitamin E

Query results interpretion may depend on "conditions" listed in the research papers.
Such Conditions may include : 
  -low or high Dose
  -format for product, such as nano of lipid formations
  -different cell line effects
  -synergies with other products 
  -if effect was for normal or cancerous cells

Filter Conditions: Pro/AntiFlg:%  IllCat:%  CanType:%  Cells:%  prod#:165  Target#:785  State#:%  Dir#:%
  wNotes=0  sortOrder:rid,rpid

Vitamin B12 / Risk Cancer Research Results

Vitamin B12 (Cobalamin) — Cancer vs Normal Pathway Effects

Pathway results for Effect on Cancer / Diseased Cells:

Core Metabolism/Glycolysis ⓘ

Drug Metabolism & Resistance ⓘ

Functional Outcomes ⓘ

Pathway results for Effect on Normal Cells:

Redox & Oxidative Stress ⓘ

Core Metabolism/Glycolysis ⓘ

Transcription & Epigenetics ⓘ

Drug Metabolism & Resistance ⓘ

Functional Outcomes ⓘ

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