# item.guide
Side-by-Side Comparison Essential Vitamins & Minerals

Vitamin B12 (Cobalamin) vs. Zinc (Elemental Zn)

Comparing 2 standards across 9 specifications. 9 key differences identified.

Comparing:
Vitamin B12 (Cobalamin)
Zinc (Elemental Zn)
Vitamin B12 (Cobalamin) →

Vitamin B12 is a cobalt-containing water-soluble corrinoid synthesized exclusively by microorganisms. Adult RDA is 2.4µg/day (no Upper Limit established), required for DNA synthesis, methionine synthase homocysteine conversion, and myelin sheath maintenance.

View full Vitamin B12 (Cobalamin) spec sheet →
Zinc (Elemental Zn) →

Zinc is an essential trace mineral serving as a structural component in over 2,000 transcription factor 'zinc finger' proteins and catalytic cofactor for 300+ enzymes. Adult RDA is 11mg (men) / 8mg (women), with a Tolerable Upper Limit of 40mg/day.

View full Zinc (Elemental Zn) spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
Vitamin B12 (Cobalamin)
Zinc (Elemental Zn)
Nutrient Type
Water-Soluble Corrinoid Vitamin Essential Trace Mineral
Adult RDA / RDI
2.4 µg / day (2.6µg pregnancy, 2.8µg lactation) 11 mg / day (Men) / 8 mg / day (Women)
Tolerable Upper Limit (UL)
None Established (Extremely low toxicity) 40 mg / day (Chronic excess induces copper deficiency)
Chemical Forms
Methylcobalamin (Active), Adenosylcobalamin (Active), Cyanocobalamin (Stable synthetic) Zinc Picolinate, Bisglycinate, Gluconate, Sulfate, Oxide
Primary Biological Function
Methionine synthase cofactor, Methylmalonyl-CoA mutase cofactor, Myelin integrity, Erythropoiesis Zinc finger DNA transcription factors, Superoxide Dismutase (SOD1), Carbonic anhydrase, Testosterone synthesis, Phagocytosis
Deficiency Condition
Pernicious / Megaloblastic Anemia, Irreversible Neurological Peripheral Neuropathy Impaired immunity, Hypogonadism, Delayed wound healing, Alopecia, Loss of taste/smell (Anosmia/Ageusia)
Top Whole Food Sources
Oysters, Beef Liver, Sardines, Salmon, Beef, Dairy, Eggs (Absent in unfortified plant foods) Eastern Oysters, Beef Chuck, Crab, Pumpkin Seeds, Hemp Hearts, Chickpeas
Absorption Mechanism
Requires Gastric Acid, R-Protein, and Intrinsic Factor (IF) via Ileal Cubam receptors —
Copper Balance Warning
— High zinc stimulates intestinal metallothionein which binds copper, risking microcytic anemia if copper is unsupplemented

Other Alternatives to Compare

Compare Vitamin B12 (Cobalamin) vs. Calcium (Elemental Ca) → Compare Vitamin B12 (Cobalamin) vs. Iodine (Elemental I) → Compare Vitamin B12 (Cobalamin) vs. Iron (Heme & Non-Heme) → Compare Vitamin B12 (Cobalamin) vs. Magnesium (Elemental Mg) → Compare Vitamin B12 (Cobalamin) vs. Potassium (Elemental K) → Compare Vitamin B12 (Cobalamin) vs. Selenium (Elemental Se) → Compare Vitamin B12 (Cobalamin) vs. Sodium (Elemental Na) → Compare Vitamin B12 (Cobalamin) vs. Vitamin A (Retinol & Beta-Carotene) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B1 (Thiamine) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B2 (Riboflavin) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B3 (Niacin / Nicotinic Acid & Nicotinamide) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B5 (Pantothenic Acid) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B6 (Pyridoxal 5'-Phosphate / PLP) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B7 (Biotin / Vitamin H) → Compare Vitamin B12 (Cobalamin) vs. Vitamin B9 (Folate & Folic Acid) → Compare Vitamin B12 (Cobalamin) vs. Vitamin C (L-Ascorbic Acid) → Compare Vitamin B12 (Cobalamin) vs. Vitamin D3 (Cholecalciferol) → Compare Vitamin B12 (Cobalamin) vs. Vitamin E (d-Alpha-Tocopherol) → Compare Vitamin B12 (Cobalamin) vs. Vitamin K1 (Phylloquinone) →