Sex hormone boost perks up grumpy old men – and protects against heart attacks

Sex hormone boost perks up grumpy old men – and protects against heart attacksInjections of testosterone to help men with low libidoShots also improved mood, fitness level and ability to concentrate | UPDATED: 22:42 GMT, 8 December 2012 Sex shots: The testosterone injections can help men with low libido Injections of the male sex hormone testosterone could offer new hope to thousands of men with low libido – while also helping to protect them against heart attacks, a new study suggests.