timtyler comments on Even if you have a nail, not all hammers are the same - Less Wrong
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Actually only synthetic beta carotene and things like retinol are implicated.
Beta carotene comes in multiple forms - and it is widely recognised that the form in carrots and greens can't be overdosed on - even if you make it into tablets. It does make your skin turn orange - but seems otherwise harmless.
There's a broadly similar story for retinol - and scientists have known about this for quite a long time, now.