Vitamin D vs Vitamin A

Evidence-based comparison of Vitamin D and Vitamin A — absorption, dosage, safety, and which is best for your needs.

Reviewed by: Supplement Hub Editorial Team · Category: Vitamin · Updated:

Vitamin D

BDNF upregulation: Increases brain-derived neurotrophic factor for neuroplasticity; Anti-inflammatory: Reduces inflammat

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Vitamin A

Immune modulation: Regulates innate and adaptive immune responses

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Detailed Comparison

Vitamin DVitamin A
CategoryVitaminVitamin
MechanismBDNF upregulation: Increases brain-derived neurotrophic factor for neuroplasticity; Anti-inflammatory: Reduces inflammatImmune modulation: Regulates innate and adaptive immune responses
SafetyYes, getting too much vitamin D can be harmful. Very high levels of vitamin D in your blood (greater than 375 nmol/L or 150 ng/mL) can cause nausea , Yes, high intakes of some forms of vitamin A can be harmful. Getting too much preformed vitamin A (usually from supplements or certain medicines) can

Which Should You Choose?

Vitamin D may be better if: Vitamin D is essential for bone health and calcium absorption. Many people need supplements to meet their vitamin D requirements.

Vitamin A may be better if: Immune modulation: Regulates innate and adaptive immune responses