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How could I determine if I’m in/out of this group

Possibly if you have many symptoms that sound like isotretinoin or tretinoin side effects (the latter is active vitamin A, the former just a twisted form of it).

As for measuring: there might be spillover of retinyl esters (storage form in the liver) into serum, but that's nothing that's commonly measured. (Serum retinol levels do not correlate with liver levels AT ALL.)

At least for isotretinoin, that would look like: dry skin, chapped lips, dry eyes, dry nostrils, dry mouth, photosensitivity, body aches in the morning.

It can also raise liver enzyme values and change lipid values.

(I recently finished a round of Accutane, basically high dose vitamin A)

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