If you are not consuming blood thinning medications, Willow is one of the safest trees for humans and all animals. It generally takes a lot of consumption to be toxic, though an exception can be people on blood thinning medicines it can be fatal, so guidance is needed. As a home remedy willow, especially the Salix alba species, is famous as a pain killer.

As with all natural remedies consumption of Willow
should be guided by a qualified herbalist or physician.
This information here is for information purposes only,
and certainly not for prescription.

best use ...  

pain relief and reduce fever
but needs medical guidance if consuming prescribed blood thinners

qualities of Willow are said to be ...

anodyne - relieves pain
antiseptic - prevents the growth of disease-causing micro-organisms.
antispasmodic - relief of physical and muscular tension
febrifuge - lowers body temperature

relationship to its myth word?  labyrinthing

With pain, we question when it will end and even if it will end, which is very similar to the purgation request we have when we enter a labyrinth, but then we unwind from the labyrinth, the pain has gone, clarity returns, and it almost feels like being reborn again. But pain comes back at some time, and then we unwind again.

toxicity? ...  as all plants have a nourishing level and toxic level

For anyone not on prescribed medications, it takes a lot of consumption of Willow material for a human to experience its toxic effects. The bitter taste of Willow prevents us from consuming enough to be toxic to.

If you are consuming blood thinning medications it is quite essential to consult a physician to explain your desire to consume Willow in any form. Anyone taking warfrin or coumadin medication could have enter into serious health problems, even fatal, when consuming aspirin as well. Therefore that's why it is wise to seek advice for consuming willow material from which aspirin is extracted.

to read about the crafting potential of Willow, please click here