> What does ingesting mercury or lead fight against?
This is a question for those who are experts in the field of Rasa Shastra.[1][2] Just like questions regarding which poisons/toxins are injected into the human body as treatment, why, and for which illness are questions for experts in the appropriate specializations of modern medicine.
No I don't think it is the same. It easily comes to mind that most treatments of radiation while toxic to the body are used to kill types of cancer. If you are going to say this practice of eating lead and mercury for medicinal purposes is useful, I would think there would be at least a use that comes to mind that you could share instead of books.
I don't think most traditional medicine practices are very useful. Similar to strict religious teaches of what food to eat, Catholic, Jewish, Sattvic diet even. They served a purpose when conceived, perhaps have interesting things that could benefit us today but in a whole. There may be an interesting herb or compound that is actually useful but usually the vast majority of it is either a placebo, damaging to the user or damaging to the environment.
I'm struggling to find in your post which specific conditions it treats, and what the pharmacology / mechanism of action is. Could you post those, please? If you need to consult your sources to answer (I assume you already read what you yourself linked, to confirm it answers the question), or ask an Ayurveda "expert" to answer, go ahead. As it stands now, it doesn't seem there are any legit usages.
> Ayurveda is based on the evidence of its times
So is globocentrism, but humans have learned since then, and moved onto more evidence based science. Science which was based on what we used to think was evidence, but no longer has evidence, is not evidence based science.
I don't think most traditional medicine practices are very useful. Similar to strict religious teaches of what food to eat, Catholic, Jewish, Sattvic diet even. They served a purpose when conceived, perhaps have interesting things that could benefit us today but in a whole. There may be an interesting herb or compound that is actually useful but usually the vast majority of it is either a placebo, damaging to the user or damaging to the environment.