1. Excessive Vitamin A (Preformed Retinol)
What it is
Vitamin A comes in two general forms: preformed vitamin A (retinol/retinyl esters) found in animal-derived foods and supplements, and provitamin A carotenoids (e.g., beta-carotene). The toxic risk is mostly from the preformed kind.
How it harms
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The liver stores vitamin A and plays a major role in metabolising/clearing it. In high doses the liver can get overloaded, leading to inflammation, liver enzyme elevation and even cirrhosis.
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