Vitamin A

vitamins

★★★★★

Vitamin A is a fat-soluble essential nutrient crucial for vision, immune function, and skin health. It exists in two forms: retinol (preformed vitamin A from animal sources) and provitamin A carotenoids (beta-carotene from plants). Adequate intake supports cellular differentiation, antioxidant defence, and reproductive health.

Benefits

✓Supports healthy vision and prevents night blindness

✓Enhances immune system function and disease resistance

✓Promotes skin health and reduces acne

✓Supports bone health and calcium absorption

✓Protects against age-related macular degeneration

Dosage

Typical Dose

700–900 mcg RAE daily (adults)

Upper Limit

3,000 mcg RAE daily from supplements

Timing

With food containing fat for optimal absorption

Forms & Bioavailability

Retinyl Palmitate

Highly bioavailable preformed retinol; rapid absorption but risk of accumulation with excess intake

Beta-Carotene

Provitamin A carotenoid; converted to retinol as needed; safer at high doses due to self-regulating conversion

Retinyl Acetate

Stable, bioavailable form; commonly used in supplements and fortified foods

Side Effects

⚠Hypervitaminosis A (toxicity) at excessive doses: nausea, headaches, dizziness, skin peeling

⚠Birth defects if excessive intake during pregnancy

⚠Joint pain and bone fragility with chronic overdose

⚠Carotenemia (yellowing of skin) from excess beta-carotene

Interactions

⚡Fat-soluble vitamin absorption affected by dietary fat intake and bile salt availability

⚡May increase anticoagulant effects when combined with warfarin

⚡Zinc deficiency impairs vitamin A absorption and metabolism

⚡Retinoid medications (isotretinoin, tretinoin) increase toxicity risk when combined

Research Summary

Extensive evidence supports vitamin A's essential role in vision and immune function; deficiency causes serious impairment in developing countries. Research confirms benefits for skin health and potential protection against certain cancers and age-related diseases. However, high-dose supplementation in smokers and high-risk populations has shown increased mortality risk, particularly with beta-carotene, suggesting dietary sources or moderate supplementation is preferable for most.

Compare Vitamin A with...

vs Vitamin D3 vs Magnesium vs Omega-3 (EPA/DHA)vs Creatine Monohydrate vs Ashwagandha (KSM-66)vs Zinc vs L-Theanine vs Vitamin B12 All comparisons →

Where to Buy Vitamin A

We recommend buying from reputable retailers. Check reviews and third-party testing.

Amazon UK →

Affiliate links — we may earn a commission at no extra cost to you.

Disclaimer: This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement, especially if you have existing health conditions or take medication.