Arthurbg hello
You know how many plants and natural products are HARMFUL and yes!
Indeed, and fortunately, it limits the destruction of the biotope. Successive generations, without our laboratory ampoules heads with all their sophisticated instruments, have experimented these plants with its effects seen on the individuals concerned. For example, certain products will be toxic for this form of life and, on the contrary, beneficial for other forms of life, and it is the experience of generations that favors or, on the contrary, disadvantages consumption.
Let us be sure to say, given the very little certainty!
It's true!
"We make science with facts, like making a house with stones: but an accumulation of facts is no more a science than a pile of stones is a house" Henri Poincaré