Buttermilk - if it is a bit lumpy am I going to poison us by using it in soda bread?

[MmeLindt]

I shook the bottle before pouring the sour buttermilk into the flour and it was a bit lumpy. Have made the dough and it seems ok, bread is in oven.

Am I going to poison us?

no of course not.

Thanks. We are all still alive this morning.