What is the recommended dosage for Vitamin A?

General: 700-900 mcg RAE/day; Immune Support: 900 mcg RAE/day

What are the side effects of Vitamin A?

Potential side effects include: Hepatotoxicity at chronic high doses, Birth defects (teratogenic at high doses during pregnancy), Nausea and headache, Bone density reduction with long-term excess.

What is vitamin A and how does it support immune function?

Vitamin A is a fat-soluble vitamin essential for maintaining mucosal barriers (skin, respiratory tract, gut lining) and supporting the development and function of immune cells including T-cells and B-cells. It is sometimes called the 'anti-infective vitamin.'

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

The recommended dietary allowance for adults is 700–900 mcg RAE per day. Clinical studies for immune outcomes have used doses up to 3,000 mcg RAE per day. The Tolerable Upper Intake Level is 3,000 mcg RAE per day for adults due to toxicity risk.

What are the potential side effects of vitamin A supplementation?

Excess preformed vitamin A (retinol) can cause nausea, headache, liver damage, and birth defects. Chronic intake above the upper limit is toxic. Beta-carotene (provitamin A) is generally safer but may increase lung cancer risk in smokers at high doses.

Vitamin A
Vitamin A

vitamin

Diğer adları: Retinol, Retinyl Palmitate, Beta-Carotene (provitamin A)

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About

Vitamin A supports mucosal barrier integrity in the respiratory and gastrointestinal tracts and regulates cell-mediated immunity, cytokine production, and lymphocyte trafficking to mucosal surfaces. Known as the 'anti-infective vitamin,' deficiency is strongly associated with increased susceptibility to infectious diseases.

How It Works

Supports mucosal barrier integrity in respiratory and GI tracts; regulates cell-mediated immunity, cytokine production, and lymphocyte trafficking to mucosal surfaces.

Evidence For Conditions

Sağlık Durumu	Derece	Çalışmalar	Katılımcılar
Pediatric Immune Support	B	10	5000	Görüntüle →

Side Effects

Hepatotoxicity at chronic high doses
Birth defects (teratogenic at high doses during pregnancy)
Nausea and headache
Bone density reduction with long-term excess

Drug & Supplement Interactions

Retinoid medications (additive toxicity risk)
Orlistat (reduces absorption of fat-soluble vitamins)
Alcohol (increases hepatotoxicity risk)
Tetracycline antibiotics (increased intracranial pressure risk)

Kullandığınız tüm takviyeler hakkında sağlık uzmanınızı mutlaka bilgilendirin.Kullandığınız tüm takviyeler hakkında her zaman sağlık uzmanınızı bilgilendirin.

Related Ingredients

Vitamin D Vitamin B6 Vitamin C Vitamin E

Kısa Bilgiler

Dozaj: General: 700-900 mcg RAE/day; Immune_Support: 900 mcg RAE/day
Formlar: capsule softgel liquid
Doğal Kaynaklar: Liver, Sweet potatoes, Carrots, Spinach, Kale, Eggs
Üst Sınır: 3,000 mcg RAE/day (preformed vitamin A)
En İyi Zaman: With meals containing fat

Kanıt Özeti

Pediatric Immune Support B

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