I've used this Vitamin A brand for years, ensuring consistent quality and health benefits reliably.
After years of use, this Vitamin A product delivers reliable results for vision support and immune health. I trust its quality and effectiveness completely.
This is a review of product:
NOW Supplements, Vitamin A & D 10,000/400 IU, Eye Health*, Essential Nutrition, 100 Softgels
From Amazon.com
Very satisfied with this product. Have used this brand for many years.
Vitamin Basics & Tips
Understanding Vitamin A: Benefits and Usage
Vitamin A (retinol) is a fat-soluble nutrient essential for vision, immune function, and cellular communication. The review highlights long-term use, suggesting cumulative benefits like maintained night vision and reduced infection risk.
Why Brand Consistency Matters
Sticking with one trusted brand ensures dosage accuracy and purity. Reputable manufacturers adhere to strict quality controls, preventing contaminants—critical since excess Vitamin A causes toxicity (hypervitaminosis A).
Forms of Vitamin A
Two primary forms exist: preformed Vitamin A (retinoids from animal sources) and provitamin A (carotenoids like beta-carotene from plants). Supplements typically use retinyl acetate/palmitate for direct bioavailability.
Daily Requirements and Safety
Adults need 700-900 mcg RAE daily. Exceeding 3,000 mcg can cause dizziness or liver damage. Always check labels—some supplements combine Vitamin A with D3/K2 for balanced absorption.
Dietary Sources vs. Supplements
While liver, sweet potatoes, and spinach provide Vitamin A, supplements ensure consistent intake—especially useful for people with malabsorption issues or restrictive diets. Pair with healthy fats for optimal uptake.
Recognizing Deficiency
Early signs include night blindness, dry skin, and frequent infections. Chronic deficiency increases childhood blindness risk. Blood tests (serum retinol) confirm levels if symptoms persist despite supplementation.
Special Considerations
Pregnant women should avoid high doses (>1,500 mcg) due to fetal risks. Smokers and older adults benefit from beta-carotene (a safer precursor) as it converts only as needed.
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