01
Why supplement?
✓
Supports normal vision
Vitamin A is a key component of rhodopsin, especially for low-light vision.
Mechanism: Established✓
Supports immune function
Vitamin A is involved in the immune barrier and normal immune-cell function.
Nutrition consensus: EstablishedADVERTISEMENT
02
How to take it
With foodTake with a meal that contains fat for better absorption
Best timeBreakfast or lunch
Calculate from the labeled retinol/RAE units; do not mix IU and mcg.
General wellness900 mcg RAE/day for adult men; 700 mcg RAE/day for adult women
Specific needsTreatment doses for deficiency or malabsorption must be set by a doctor according to the condition.
How oftenStay near the recommended daily intake; do not raise the dose on your own long term.
03
What to watch
Cautions
Pregnant people should not self-start high-dose preformed vitamin A; excess can harm the fetus.
People with liver disease or taking vitamin A medicines should ask a doctor first.
Common side effects
· Nausea or headache (high doses)
· Dry skin (long-term high doses)
Rare but important
· Chronic excess can injure the liver and raise intracranial pressure.
Long-term dependenceNot addictive; fat-soluble vitamins can be stored, so high long-term doses carry toxicity risk.