Buying Bitcoins and holding it can make you money if the price goes up, but also can make you lose a lot of money if the price goes down. Investing your Bitcoin by lending it can certainly ensure it continues making profits.
The question is, how do you invest your Bitcoins?
Nickles.info is a great source of info regarding Bitcoin investment. There are some good tutorials exclusively demonstrating how you can do your Bitcoin investment buy using one of the best platforms out there.