A headgefund would be the more prevelant way to investment your retirement income. It really depends how much you have saved up, and the amount you are receiving with each payment. If your income leaves you with a moderate to low amount to use in investment, you should consider investing in blue chip stocks, money market funds, or short term bonds. These are all safe investments that are low risk, but will most likely result in gains. If you have a surplus of cash that you can invest, then you may want to consider more high risk investment such as penny stocks. Although there is greater risk in losing money, you will have much greater gains.