With many of us thinking more about our health than ever before, the question of how we can boost our immune system has never been more relevant. From superfoods to supplements and exercise regimes, there are plenty of products and programmes that claim to improve our immune health and improve our chances of fighting off infection. But how many of them actually work? This is the question Dr Ronx Ikharia, an emergency medicine specialist, seeks to answer in the documentary The Truth About... Boosting Your Immune System, which airs on BBC1 tonight at 9pm. Together with leading experts in the field, Dr Ikaria reveals the practical steps everyone can take to give our body the tools it needs to defeat the common cold and flu. And perhaps even Covid.