This isn’t an easy topic to write about nor is it an easy topic to find information about since it’s quite complex.
Abstract
Design: Adults aged 18–54 y with retinitis pigmentosa but in generally good health (n = 146) were supplemented with 4500 RE (15000 IU) vitamin A/d for ≤12 y (group A) and compared with a similar group (n = 149) that received 23 RE (75 IU)/d (trace group). Mean total consumption of vitamin A in group A was 5583 RE (18609 IU)/d (range: 4911–7296 RE/d, or 16369–24318 IU/d) and that in the trace group was 1053 RE (3511 IU)/d (range: 401–3192 RE/d, or 1338–10638 IU/d). No clinical symptoms or signs of liver toxicity attributable to vitamin A excess were detected.
Conclusions: Prolonged daily consumption of <7500 RE (<25000 IU) vitamin A/d can be considered safe in this age group.
Vitamin A 25,000Iu (7500 Μg Re) X 90 Capsules
Unlike water soluble vitamins that need to be taken daily, fat soluble vitamins are stored in the liver, previously absorbed from dietary fats in the intestine, and do not need to be consumed daily.
What Does Vitamin A Do?
Suggested Adult Use
1 capsule every two or three days. Health Leads formula
Each plant source vegetarian capsule contains:
25,000iu Vitamin A (as Retinol acetate)
Organic rice flour
Other ingredients: None
Vitamin A units of measure (iu and µg)
Vitamin A is commonly measured in International Units (abbreviated to iu) which is a measurement of its biological activity. So 25,000 iu = 7,500 µg RE (Retinol Equivalents).
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We will never use known harmful additives, hydrogenated oil, trans fats, colourants, sweeteners, or excipients such as magnesium stearate. Rarely we may have to use a natural filler but research carefully those we do use, such as organic rice flour.
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The daily biological need for vitamin A is estimated to be 800 retinol equivalents (RE)/d (2667 IU/d) for adult women and 1000 RE/d (3300 IU/d) for adult men; doses > or = 7500 RE (> or = 25000 IU)/d are considered potentially toxic over the long term.
Mean total consumption of vitamin A in group A was 5583 RE (18609 IU)/d (range: 4911-7296 RE/d, or 16369-24318 IU/d) and that in the trace group was 1053 RE (3511 IU)/d (range: 401-3192 RE/d, or 1338-10638 IU/d).
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It plays an important role in helping the eyes adapt to light changes.