Vitamin A
Vitamin4 forms compared ↓
Also known as: Retinol, Retinyl palmitate, Retinyl acetate, Beta-carotene, Provitamin A
A
Grade A💊 2500-5000 IU daily🎯 12 primary uses🔗 3 synergies⚠️ Review warnings
Levels upNutrition+50 pts
Overview
A fat-soluble vitamin essential for vision, immune function, and skin health that the body converts from beta-carotene as needed. Beta-carotene is a plant-derived precursor that acts as an antioxidant and is safer at high doses than preformed retinol.
Primary Uses
Vision healthImmune supportSkin healthCell differentiationWound healingSkin repairImmune functionEpithelial healthImmune barriersRespiratory healthMucosal immunityVision
Frequently Asked About Vitamin A
How much Vitamin A should I take?
The typical effective range is 1,500-3,000 mcg RAE. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take Vitamin A?
With fat-containing meal. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take Vitamin A with food?
Yes.
What is the best form of Vitamin A?
Retinyl Palmitate is generally the best-absorbed form (Preformed vitamin A esterified with palmitic acid). Cheaper forms exist but often deliver less usable Vitamin A per dose.
Does Vitamin A interact with medications?
Yes — known interactions include Retinoids. If you take any prescription medication, talk to your doctor or pharmacist before starting Vitamin A.
What does Vitamin A pair well with?
Vitamin A stacks well with Zinc, Vitamin D, and Vitamin E — these combinations either improve absorption or work synergistically toward common goals.
Who should not take Vitamin A?
Vitamin A should be avoided or used with caution by people with Pregnancy (high doses) and Liver disease. Pregnant or breastfeeding women should consult a healthcare provider before use.
Compare Forms
4 formsDifferent chemical forms vary in absorption, side effects, and best use cases. Higher bioavailability scores indicate better absorption.
Retinyl Palmitate
HIGH 95Preformed vitamin A esterified with palmitic acid
Best for:General supplementationVision supportImmune function
💡 Excellent. Hydrolyzed to retinol in the gut, then chylomicron-transported.
✅ Pros
- • Highly bioavailable
- • Well-studied
- • Stable in capsules
⚠️ Cons
- • Toxic at chronic high doses (>10,000 IU/day)
- • Avoid in pregnancy at high doses
📝 Standard form in most multivitamins
Retinyl Acetate
HIGH 95Preformed vitamin A esterified with acetic acid
Best for:General supplementationPharmaceutical preparations
💡 Excellent. Equivalent bioavailability to retinyl palmitate.
✅ Pros
- • Highly bioavailable
- • Well-tolerated
⚠️ Cons
- • Same toxicity ceiling as palmitate
📝 Interchangeable with retinyl palmitate
Beta-Carotene (Provitamin A)
GOOD 75Plant carotenoid converted to retinol by the body as needed
Best for:PregnancyAvoiding hypervitaminosis AVegan supplementation
💡 Variable. Conversion to retinol depends on iron, zinc, and a BCMO1 gene variant carried by ~45% of people that halves conversion efficiency.
✅ Pros
- • No toxicity ceiling
- • Antioxidant in its own right
- • Safer in pregnancy
⚠️ Cons
- • Inefficient conversion in many people
- • Skin yellowing at high doses
- • Doesn't reliably correct deficiency
📝 Safer but unreliable. For deficiency correction, use preformed vitamin A.
Mixed Carotenoids
GOOD 80Beta-carotene with alpha-carotene, lutein, zeaxanthin, lycopene
Best for:Whole-food approachEye healthAntioxidant breadth
💡 Better than isolated beta-carotene; carotenoids are synergistic.
✅ Pros
- • Whole-spectrum antioxidant
- • Eye-health carotenoids included
- • Most natural
⚠️ Cons
- • More expensive
- • Still subject to BCMO1 conversion limits
📝 Best plant-based option; use alongside preformed A for assured intake
Dosage
Typical range
2500-5000 IU daily
Timing
With fat-containing meal
With food
Yes
Dose Tiers
RDA / DV
700-900 mcg RAE
Low
<700 mcg RAE
Moderate
900-2,000 mcg RAE
Optimal
1,500-3,000 mcg RAE
Upper Limit
3,000 mcg RAE
Duration
Long-term at moderate doses
Special Populations
Caution in pregnancy
Research & Studies
Search the literature now
We haven’t curated landmark studies for Vitamin Ayet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Mechanism of Action
- • Retinal for vision
- • Gene expression regulation
- • Immune cell function
- • Epithelial tissue maintenance
Evidence Quality
Evidence Grade A
Essential vitamin with well-established functions
Safety & Contraindications
Serious Warnings
- • Toxicity at high doses
- • Teratogenic in pregnancy
Contraindications
- • Pregnancy (high doses)
- • Liver disease
Common Side Effects
- • Well tolerated at normal doses
Pregnancy & Breastfeeding
Max 10000 IU preformed
Liver & Kidney Notes
Stored in liver
Interactions
💊 Medications
- • Retinoids
🧪 Supplements
- • Part of multivitamins
🍽️ Food & Alcohol
- • Liver, eggs, orange vegetables
Stacking & Synergies
Pairs Well With
Avoid Combining With
Other retinoids
Best Goal Synergies
ImmuneVisionSkin
Buying Guide
What to Look For
- • Form specified
Standardization Markers
IU or mcg RAE stated
Adulteration risk
Low
Practical Notes
- • Beta-carotene safer for most
- • Monitor total intake
- • Short-term higher doses for healing
- • Avoid in pregnancy
- • Take with fat
- • Avoid high-dose retinol long-term
- • Beta-carotene safer in pregnancy
- • Preformed more potent
Tags
fat-solublevisionimmuneskinvitaminwoundhealingtissuemucosalbarrierantioxidantessential nutrientessentialimmunitypreformed retinoidvision supportimmune supportwell-establishedessential-nutrientimmune-supportskin-healthwell-researched
Top Products with Vitamin A
Highest-scored catalog products containing Vitamin A, ranked by our scoring engine.
Advanced NutrientsThorne88
Basic Nutrients 2/DayThorne88
Basic PrenatalThorne88
Men's Multi 50+Thorne88
Related Guides
In-depth guides covering Vitamin A — protocols, comparisons, and use cases.
More in Vitamin
Other ingredients in the Vitamin category.
B-Complex (Energy Focus)
Essential coenzymes for energy metabolism. Methylated forms for optimal function.
Benfotiamine
Fat-soluble thiamine derivative with superior bioavailability. Particularly effective for diabetic neuropathy and AGE reduction.
Beta-Carotene
Provitamin A carotenoid converted to retinol as needed. Cannot cause toxicity. Provides independent antioxidant benefits.
Folate
Essential B vitamin for DNA synthesis, cell division, and methylation. Critical during pregnancy.
Methylfolate
Active form of folate for those with MTHFR variants. Critical for methylation and mood.
Multivitamin (Athletic Formula)
Broad-spectrum insurance for micronutrient gaps. Athletes may need more than RDA.
Last reviewed: September 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, September). Vitamin A — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/vitamin-a
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.