An edited extract from a new book by Dr Michael Mosley called
4 Weeks to Better Sleep
Seemingly safe substances like aspirin could harm your unborn baby.
German scientist Dr Adolf Klenk has developed a brand of shampoos and conditioners containing caffeine to combat hair loss.
Scientists have worked out how caffeine might offer protection against some skin cancers, a finding that could lead to better sunscreens.
Are energy drinks creating a generation of binge drinkers and troubled teens? Nechama Brodie investigates.