I bought with my normal size of 1000$ without taking care that this kind of companies under 1$/share are so volatile, so a few pennies against my position got in my bigger lost. Later it bounced and after that it went down. But i couldn't wait for the bounce, that lost that it didnt allow me to go out with a 50$ lost (my limit) made me lose more than thought. So since now, on this kind of volatile stocks 50% size.