I'm sure you dizzy if a friend is borrowing money. They try to take advantage of friendship. forget it all. follow my way.
You set the conditions to borrow money. how?. if your friends want to come and borrow money. conditions you specify.
Each loan must have collateral. eg if he borrowed USD100. need to have collateral goods or others similar or higher value.
You must try this tips before you will get cheat by your best friend or workmate.