From a compliance lens, dosage guidance can also blur into advising/claiming outcomes. Better to keep it informational and general.

So what can I ask without getting shut down?

Ask about: what 'variability' means, risk factors (who should avoid), how to evaluate sourcing/testing, how to read labels/COAs, and what to do if someone feels severely unwell (seek help).

Also you can just learn without doing anything. Curiosity doesn't require action.

And honestly, the best safety tool is not buying scam jars. Quality literacy prevents a lot of harm.