"Of course! There are qi testing treasures- You cycle a small amount into them to get a rough reading of toxicity. Blood testing elixirs, which turn a precise color based on pill toxicity level. What we call 'pill toxicity' is at times, two different things- The impurities and unwanted energies that linger after a pill disperses, and cascading effects upon the spirit usually caused by severe overuse or a bad interaction. Or trying to consume a pill that is not designed for your cultivation level. Many pills are simply too potent to be consumed by those who are weak. I would call the first pill toxicity and the second, pill scarring.
"As for evaluating negative indications, the most reliable way is to learn alchemy in all its details yourself, which is of course a journey of years in the best case. The second is to listen to your provider's warnings. Half of the complaints of bad pills are from idiots who don't listen. -Ahem." She takes a deep breath and composes herself. "The Mirror Evaluation Art allows one to closely inspect the interactions all the pills and foreign qi in their systems, and also to visualize the hypothetical interaction of two, or at higher mastery, more, signatures that are in front of them."
"As for general tips and issues to watch out for, I'm sure many things I would consider basic common sense would not occur to you, but that does not mean I could list them out on a whim without being prompted specifically... The most obvious is to remember the elemental cycle and keep in mind your affinities, I suppose. And the opposition of yin and yang. As a woman, you will probably have a slight yin nature, so powerfully yang pills can sicken you and will contribute more to pill toxicity, while yin pills will be easier to consume. The same principle goes for the elemental cycle, where earth or metal pills will work better for you, but fire worse- Though some types of pills need to be of a suppressing element. For example, a body refinement pill formulated for you would need to have strong fire presence, in order to overcome your metal nature and actually apply the effect it carries."
She seems to catch herself and cut herself off from rambling, adopting a more respectful register of speech. "Honored customer, I apologize. Please do not take this casual instruction as indication of true safety; There are far too many factors to sum up in a moment, and I would be ashamed if you made a hasty decision based on my own faulty instruction."