Zak Haddad has been kickstarting his day with a cup of coffee infused with lion's mane - a type of mushroom - for the past three years. He says it gives him a "really clear, focused feeling", without the "spike and crash you can sometimes get from strong coffee". Coffees made with extra ingredients like mushrooms, protein and collagen are known as "functional coffees" - which aim to provide consumers with benefits beyond the typical caffeine boost. For years they've been a familiar sight in the