If you talked about the supplements you are taking during your last visit:

What prompted the discussion?

What was going on in your mind when you mentioned the supplement(s)?

What kept you from mentioning other supplements you are taking during your last visit?

If you did not talk about supplements:

Why did you not bring them up?

Is there anything that could have prompted you to discuss them?

Under what conditions do you feel it is necessary to discuss dietary supplement use?

Under what conditions do you feel it is not necessary to discuss dietary supplement use?