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

Vitamin A (Retinol & Beta-Carotene) vs. Zinc (Elemental Zn)

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

Comparing:
Vitamin A (Retinol & Beta-Carotene)
Zinc (Elemental Zn)
Vitamin A (Retinol & Beta-Carotene) →

Vitamin A is an essential fat-soluble isoprenoid comprising preformed retinol and provitamin A carotenoids. Adult RDA is 900 µg RAE (men) / 700 µg RAE (women), with a Tolerable Upper Limit of 3,000 µg/day preformed retinol, essential for rhodopsin retinal photoreception, epithelial differentiation, and immune cell proliferation.

View full Vitamin A (Retinol & Beta-Carotene) 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 A (Retinol & Beta-Carotene)
Zinc (Elemental Zn)
Nutrient Type
Fat-Soluble Isoprenoid Vitamin Essential Trace Mineral
Adult RDA / RDI
900 µg RAE / day (Men) / 700 µg RAE / day (Women) 11 mg / day (Men) / 8 mg / day (Women)
Tolerable Upper Limit (UL)
3,000 µg / day (10,000 IU) (Preformed retinol only; no UL for beta-carotene) 40 mg / day (Chronic excess induces copper deficiency)
Chemical Forms
Retinyl Palmitate (Preformed Animal), All-Trans Retinol, Beta-Carotene (Plant Provitamin) Zinc Picolinate, Bisglycinate, Gluconate, Sulfate, Oxide
Primary Biological Function
11-cis-retinal rhodopsin visual cycle, RAR/RXR nuclear receptor gene transcription, Mucosal barrier immunity Zinc finger DNA transcription factors, Superoxide Dismutase (SOD1), Carbonic anhydrase, Testosterone synthesis, Phagocytosis
Deficiency Condition
Nyctalopia (Night blindness), Xerophthalmia, Bitot's spots, Keratinization of mucous membranes Impaired immunity, Hypogonadism, Delayed wound healing, Alopecia, Loss of taste/smell (Anosmia/Ageusia)
Top Whole Food Sources
Beef Liver, Cod Liver Oil, Sweet Potatoes, Carrots, Spinach, Curly Kale, Butter Eastern Oysters, Beef Chuck, Crab, Pumpkin Seeds, Hemp Hearts, Chickpeas
Hepatic Storage
80–90% of total body Vitamin A is stored in hepatic stellate cells as retinyl esters —
Copper Balance Warning
— High zinc stimulates intestinal metallothionein which binds copper, risking microcytic anemia if copper is unsupplemented

Other Alternatives to Compare

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