What is the recommended dosage for Vitamin A (Retinol)?

General: 700-900 mcg RAE/day (RDA); Skin Health: 700-900 mcg RAE/day (do not exceed UL)

What are the side effects of Vitamin A (Retinol)?

Potential side effects include: Headache and nausea at high doses, Skin dryness and peeling (hypervitaminosis A), Liver toxicity with chronic excess, Birth defects (teratogenic — pregnancy contraindication).

What is vitamin A (retinol) and how may it support skin health?

Vitamin A and its derivatives (retinoids) are fundamental to skin cell turnover, collagen production, and sebum regulation. While topical retinoids are well-established in dermatology, oral vitamin A at physiological doses supports normal skin cell differentiation. Oral isotretinoin (a prescription retinoid) is the most effective acne treatment available.

What dosage of vitamin A has been studied for skin health?

The RDA for vitamin A is 700–900 mcg RAE (2,300–3,000 IU) daily. Prescription-level doses (isotretinoin) for acne are 0.5–1 mg/kg/day and require medical supervision. Over-the-counter vitamin A supplements typically contain 750–1,500 mcg. Beta-carotene, a precursor, is safer at high doses as conversion is regulated by the body.

What are the potential side effects of vitamin A supplements?

Excessive preformed vitamin A (retinol) causes hypervitaminosis A, presenting as dry skin, peeling, headache, nausea, and in severe cases, liver damage. It is teratogenic and must be avoided during pregnancy. The tolerable upper intake level is 3,000 mcg (10,000 IU) for adults. Beta-carotene is much safer as a vitamin A source.

Vitamin A (Retinol)

vitamin

Also known as: Retinol, Retinyl Palmitate, Retinyl Acetate, Beta-Carotene (provitamin A), Preformed Vitamin A

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About

Vitamin A binds retinoic acid receptors (RARs) in skin cells to regulate keratinocyte differentiation, stimulate epidermal turnover, upregulate collagen gene expression, and inhibit matrix metalloproteinases (MMPs) that degrade collagen and elastin. While topical retinoids are the gold standard for photoaging and acne, oral vitamin A at RDA levels supports these processes from within.

How It Works

Binds retinoic acid receptors (RARs) in skin cells to regulate keratinocyte differentiation, stimulate epidermal turnover, upregulate collagen gene expression, and inhibit matrix metalloproteinases (MMPs) that degrade collagen and elastin.

Evidence For Conditions

Condition	Grade	Studies	Participants
Acne	C	6	400	View →
Aging Skin & Wrinkles	C	5	300	View →
Keratosis Pilaris	D	2	100	View →

Side Effects

Headache and nausea at high doses
Skin dryness and peeling (hypervitaminosis A)
Liver toxicity with chronic excess
Birth defects (teratogenic — pregnancy contraindication)

Drug & Supplement Interactions

Retinoid medications (additive toxicity risk — do not combine)
Tetracycline antibiotics (increased intracranial pressure risk)
Anticoagulants (high-dose vitamin A may increase bleeding risk)
Hepatotoxic drugs (additive liver stress)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Biotin Niacinamide Vitamin C Vitamin D Vitamin E

Quick Facts

Dosage: General: 700-900 mcg RAE/day (RDA); Skin_Health: 700-900 mcg RAE/day (do not exceed UL)
Forms: softgel capsule liquid tablet
Natural Sources: Liver, Sweet potato, Carrots, Spinach, Eggs, Dairy
Upper Limit: 3,000 mcg RAE/day (10,000 IU preformed vitamin A) — teratogenic at high doses
Best Time: With meals containing fat

Evidence Summary

Acne C

Aging Skin & Wrinkles C

Keratosis Pilaris D

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.