When my naturopath suggested raw pumpkin seeds, daily, he said fifty. This makes about one level round soupspoonful.
However, it wasn't for a parasite
cleanse, as far as I know. I think he recommended for the good oil content.
For your purposes, you could take 2 or 3 soupspoonfuls daily, I would imagine.
I haven't heard of any toxicity associated with this food.