What did Niall poison Keiron with in Hollyoaks?

Question

What would you have in your bathroom cabinet that you could add to a drink in such a small quantity it wouldn't effect the taste but would kill a fully grown man?

Answer 1

Heroine

Answer 2

Why do you watch hollyoaks? It's a pile of shite!

Answer 3

Omg.Its just a soap its fictional,however there is poisons out there that are like that,"ricin" is one of them.It only takes a tiny amount even just on the skin to kill you