CYANOCOBALAMIN – VITAMIN B12 (CYANOCOBALAMIN)

1. CHEMICAL IDENTITY AND DEFINITION

Parameter	Information
Chemical Name	Cyanocobalamin / Cobalamin
Other Names	Vitamin B12, E101
CAS Number	68-19-9
Chemical Formula	C₆₃H₈₈CoN₁₄O₁₄P
Molecular Weight	1,355.38 g/mol
Appearance	Dark red crystalline powder
Odor	Odorless
Solubility	Soluble in water
Vitamin Class	Water-soluble vitamin (B-complex)

2. PHYSICAL AND CHEMICAL PROPERTIES

Property	Value
Appearance	Dark red crystalline powder
Chemical Formula	C₆₃H₈₈CoN₁₄O₁₄P
Molecular Weight	1,355.38 g/mol
CAS Number	68-19-9
Solubility	Soluble in water
Melting Point	> 300 °C (decomposes)
pH (Aqueous Solution)	~4.5 – 5.5
Stability	Sensitive to light and moisture
Color	Dark red
Storage	Protected from light, dry environment

3. CHEMICAL STRUCTURE

Chemical Structure:

Vitamin B12 has a complex structure consisting of a corrin ring system with a central cobalt atom.

Main Components:

Corrin Ring: Macrocyclic structure containing four pyrrole rings
Cobalt Ion (Co): Central metal ion
Cyano Group (CN): Bound in cyanocobalamin form
Nucleotide Group: Provides structural stability
Amine Group: For biological activity

4. TYPES OF VITAMIN B12

Type	Description
Cyanocobalamin	Most common synthetic form; stable and inexpensive
Methylcobalamin	Natural, active form; for nervous system
Adenosylcobalamin	Natural, active form; for energy metabolism
Hydroxocobalamin	Natural form; long-term storage, smoking cessation treatment

5. FUNCTIONS IN THE BODY

Function	Description
Red Blood Cell Production	Essential for erythropoiesis in bone marrow
Nervous System Health	Myelin sheath synthesis and maintenance
DNA Synthesis	Coenzyme for nucleic acid synthesis
Cell Metabolism	Energy production and metabolic pathways
Homocysteine Metabolism	Converts homocysteine to methionine
Fatty Acid Metabolism	Breakdown of fatty acids

6. BENEFITS

Benefit	Description
Nervous System	Ensures healthy functioning of the nervous system
Cognitive Health	Reduces risk of dementia and cognitive impairment
Energy Metabolism	Increases energy production, prevents fatigue
Anemia Prevention	Prevents anemia together with folic acid
Carbohydrate Metabolism	Supports conversion of carbohydrates to energy
Heart Health	Lowers homocysteine levels, preventing cardiovascular diseases
Hair, Skin, Nails	Supports hair, skin, and nail health

7. DEFICIENCY SYMPTOMS

System	Symptoms
Hematological	Megaloblastic anemia, fatigue, shortness of breath, palpitations
Neurological	Numbness in hands/feet, difficulty walking, reduced reflexes, balance problems
Cognitive	Memory loss, concentration difficulties, impaired judgment
Psychiatric	Depression, irritability, anxiety
Gastrointestinal	Nausea, diarrhea/constipation, loss of appetite, weight loss
Other	Pale skin, hair loss, mouth ulcers, vision problems

8. SOURCES

8.1. Animal Sources

Source	Description
Red Meat	Beef, lamb, veal
Poultry	Chicken, turkey
Fish	Salmon, sardines, trout
Shellfish	Mussels, oysters, shrimp
Organ Meats	Liver, kidney (richest sources)
Eggs	Especially egg yolk
Milk and Dairy	Milk, yogurt, cheese

8.2. Plant Sources

Source	Description
Fermented Soy Products	Tempeh, miso, soy sauce (via fermentation)
Fortified Foods	Plant milks, breakfast cereals

Note: Vegetables and fruits do not naturally contain B12. Plant sources are very limited.

9. RISK GROUPS

Group	Reason
Individuals over 50	Reduced absorption
Vegans and Vegetarians	No animal product consumption
Pernicious Anemia Patients	Intrinsic factor deficiency
Small Intestine Surgery Patients	Shortened absorption area
Intestinal Diseases	Gastritis, celiac, Crohn's disease
Alcohol Dependents	Impaired absorption and storage
Metformin Users	Drug reduces B12 absorption
Long-term Acid Reducer Users	Reduced acid impairs absorption
Pregnant Women and Young Children	In case of inadequate nutrition

10. TREATMENT AND DOSAGE

Parameter	Information
Daily Requirement	2 – 3 mcg
Pregnancy	~2.6 mcg
Breastfeeding	~2.8 mcg
Mild Deficiency	Oral tablets
Severe Deficiency / Absorption Issues	Injection (intramuscular)
Normal Blood Level	200 – 800 pg/mL
Low Considered	< 200 pg/mL

11. SAFETY AND SIDE EFFECTS

Parameter	Information
Toxicity	Low; excess is excreted in urine
Excess	Not harmful; body stores and excretes excess
Side Effects	Very limited (rarely acne)
Allergy	Rare; in sensitive individuals
Drug Interactions	Metformin, proton pump inhibitors

12. IMPORTANT PRECAUTIONS

Warning	Description
Neurological Damage	If untreated, irreversible nerve damage may occur
Dementia and Alzheimer's	Definite protective effect not proven
Vegetarian/Vegan Alert	Must consume supplements or fortified foods
Absorption Issues	Injection is mandatory in pernicious anemia

13. REGULATORY STATUS

Region / Authority	Status
EFSA	Daily reference intake established
FDA	Daily Value (DV) 2.4 mcg
Turkey	Approved as food supplement
Codex	Approved for food supplements and fortification

14. OTHER NAMES AND SYNONYMS

Type	Name
Turkish Names	B12 Vitamini, Kobalamin, Siyanokobalamin
English Names	Vitamin B12, Cyanocobalamin, Cobalamin
E Number	E101
CAS Number	68-19-9

15. SUMMARY AND CRITICAL WARNINGS

Parameter	Value
Product	Vitamin B12 (Cyanocobalamin)
CAS Number	68-19-9
Formula	C₆₃H₈₈CoN₁₄O₁₄P
Appearance	Dark red crystalline powder
Primary Function	Red blood cells, nervous system, DNA synthesis

CRITICAL WARNINGS

1. UNTREATED DEFICIENCY: May lead to irreversible neurological damage.

2. VEGETARIAN/VEGAN ALERT: B12 is found only in animal products. Vegetarians and vegans must take supplements or consume fortified foods.

3. EXCESS IS NOT HARMFUL: The body does not store excess B12; it is excreted in urine. Toxicity is low.

4. SIDE EFFECTS: Very limited; rarely acne.

5. DRUG INTERACTIONS: Metformin and acid-reducing drugs (proton pump inhibitors) reduce B12 absorption.

6. DEMENTIA AND ALZHEIMER'S: Definite protective effect not proven.

7. PERNICIOUS ANEMIA: Oral intake is insufficient in intrinsic factor deficiency; injection is required.

8. STORAGE: Store in a dry, cool place protected from light.

9. NORMAL RANGE: 200-800 pg/mL; below 200 is considered low.

10. DAILY REQUIREMENT: 2-3 mcg; 2.6 mcg for pregnant women, 2.8 mcg for nursing mothers.

PART 2: METHYLCOBALAMIN vs CYANOCOBALAMIN – COMPARISON GUIDE

1. GENERAL OVERVIEW

Both Methylcobalamin and Cyanocobalamin are forms of Vitamin B12 (CAS 68-19-9). They share the same fundamental molecular structure but differ in their chemical composition, biological activity, and how the body utilizes them. Understanding these differences is essential for selecting the right form for specific applications.

2. METHYLCOBALAMIN – THE ACTIVE FORM

2.1. Chemical Identity

Parameter	Information
Chemical Name	Methylcobalamin
CAS Number	13422-55-4
Molecular Formula	C₆₃H₉₁CoN₁₃O₁₄P
Molecular Weight	1,344.38 g/mol
Form	Natural, active coenzyme form
Appearance	Red crystalline powder

2.2. Key Characteristics

Feature	Description
Natural and Active	Directly utilized by the body without conversion
Nervous System Support	Protects myelin sheath; supports nerve cell function
Energy Metabolism	Plays a direct role in cellular energy production
Methylation Processes	Essential for DNA synthesis and genetic regulation
Bioavailability	Higher due to no conversion requirement
Tissue Retention	Better retained in nerve tissues

2.3. Advantages

Advantage	Description
Immediate Use	No conversion needed; ready for biological activity
Neuroprotective	Stronger effect on nervous system health
Methyl Group Donor	Supports homocysteine metabolism
Superior in Neurological Conditions	Preferred for neuropathy, neurodegenerative disorders

3. CYANOCOBALAMIN – THE SYNTHETIC FORM

3.1. Chemical Identity

Parameter	Information
Chemical Name	Cyanocobalamin
CAS Number	68-19-9
Molecular Formula	C₆₃H₈₈CoN₁₄O₁₄P
Molecular Weight	1,355.38 g/mol
Form	Synthetic, pro-vitamin form
Appearance	Dark red crystalline powder

3.2. Key Characteristics

Feature	Description
Synthetic Form	Most common form in supplements
Requires Conversion	Must be converted to Methylcobalamin or Adenosylcobalamin
Red Blood Cell Production	Strong effect on hematological health
Stability	Longer shelf life; easy to manufacture and store
Cost-Effective	Generally more affordable

3.3. Advantages

Advantage	Description
Long Shelf Life	Highly stable; easy to store
Cost-Effective	Cheaper to produce and purchase
Widely Available	Most commonly used in supplements and fortified foods
Strong Hematological Effects	Effective against anemia
Well-Studied	Extensive research and safety data available

4. COMPARISON TABLE

Feature	Methylcobalamin	Cyanocobalamin
Form	Natural, active coenzyme	Synthetic, pro-vitamin
Biological Form	Directly utilized	Requires conversion
CAS Number	13422-55-4	68-19-9
Molecular Weight	1,344.38 g/mol	1,355.38 g/mol
Chemical Group	Methyl group (CH₃)	Cyano group (CN)
Nervous System Effect	Stronger, direct	Indirect (after conversion)
Energy Metabolism	Direct role	Indirect (after conversion)
Methylation	Direct methyl donor	Indirect
Shelf Life	Shorter	Longer
Stability	Less stable (sensitive to light/heat)	More stable
Cost	More expensive	Less expensive
Neuropathy Treatment	Preferred	Suitable
Anemia Treatment	Effective	Highly effective
Bioavailability	Higher	Good (after conversion)
Tissue Retention	Better in neural tissues	Distributed systemically

5. CONVERSION PATHWAY

Cyanocobalamin Conversion Process:

Cyanocobalamin (Synthetic)
         ↓
    Cyanocobalamin
         ↓
    Intracellular conversion
         ↓
    Hydroxocobalamin
         ↓
    ↓              ↓
Methylcobalamin   Adenosylcobalamin
(Active Form)     (Active Form)

Methylcobalamin:

Methylcobalamin (Natural)
         ↓
    Directly utilized
         ↓
    Active coenzyme without conversion

6. APPLICATION DIFFERENCES

Application	Methylcobalamin	Cyanocobalamin
Neurological Disorders	✅ Preferred	⚠️ Less effective
Peripheral Neuropathy	✅ Highly recommended	⚠️ Limited
Alzheimer's / Dementia	✅ Supported	❓ Limited evidence
Anemia (Pernicious / Megaloblastic)	✅ Effective	✅ Highly effective
Fatigue / Energy	✅ Effective	✅ Effective
Vegan/Vegetarian Supplementation	✅ Good choice	✅ Good choice (cost-effective)
Homocysteine Reduction	✅ Effective	✅ Effective
Methylation Support	✅ Strong	⚠️ Requires conversion
General Supplementation	✅ Good	✅ More common
Fortified Foods	❌ Rarely used	✅ Most common

7. SAFETY AND TOLERABILITY

Parameter	Methylcobalamin	Cyanocobalamin
Toxicity	Very low	Very low
Side Effects	Rare	Rare
Allergic Reactions	Very rare	Very rare (cyanide concerns in high doses)
Cyanide Content	None	Contains cyanide group (0.1 mg cyanide per 1,000 mcg)
Safety for Long-Term Use	Excellent	Excellent
Pregnancy/Lactation	Safe	Safe
Drug Interactions	Limited	Metformin, PPIs

Note on Cyanide: The cyanide content in Cyanocobalamin is extremely low (0.1 mg per 1,000 mcg) and is safely metabolized and excreted by the body. It poses no health risk at normal supplement dosages.

8. COST COMPARISON

Feature	Methylcobalamin	Cyanocobalamin
Production Cost	Higher	Lower
Retail Price	More expensive	More affordable
Available Forms	Supplements, injections	Supplements, injections, fortified foods
Prescription Status	OTC and prescription	OTC and prescription

9. SUMMARY AND RECOMMENDATIONS

Criteria	Methylcobalamin	Cyanocobalamin
Best For Neurological Conditions	✅ Yes	❌ No
Best For Anemia	✅ Yes	✅ Yes
Best For General Supplementation	✅ Yes	✅ Yes
Best For Fortified Foods	❌ No	✅ Yes
Best For Cost-Effectiveness	❌ No	✅ Yes
Best For High Bioavailability	✅ Yes	❌ No
Best For Methylation Support	✅ Yes	❌ No

RECOMMENDATIONS

Choose Methylcobalamin if:

Neurological support is needed (neuropathy, nerve damage)
High bioavailability is required
Methylation support is desired
Budget is not a primary concern
Seeking immediate biological activity

Choose Cyanocobalamin if:

Cost-effectiveness is important
Supplementing for general B12 deficiency
Anemia (pernicious/megaloblastic) is being treated
Fortified food production is needed
Longer shelf life is required

IMPORTANT DISCLAIMER: This Technical Data Sheet is for informational purposes only and is prepared based on available technical data. This document is not a substitute for medical advice. For any health condition or suspected deficiency, consult a healthcare professional. For complete safety, storage, use, and regulatory compliance information, refer to the official documentation provided by the manufacturer/supplier.

Cyanocobalamin, Cobalamin, Vitamin B12, E101, 68-19-9