L-theanine

An amino acid that causes feelings of calm alertness by increasing levels of neurotransmitters GABA, dopamine and serotonin, L-theanine is naturally found in tea but not coffee, which is why it’s become a popular supplement to take alongside an Americano or flat white. “Some studies have found that L-theanine, when combined with caffeine, significantly improves attention and cognitive performance,” says Emily Barker, registered nutritionist and founder of Roots and Shoots.

L-theanine fans claim that the supplement reduces the jittery effect some people experience when that first coffee of the day hits, but Barker suggests tea might be a better alternative: “As green tea is naturally rich in L-theanine, I would recommend going down that route rather than a supplement plus coffee. Green tea gives you the cognitive boost of caffeine alongside the calming effects of L-theanine all in one.”

Creatine

Previously the preserve of bodybuilders, creatine has gone mainstream in recent years as research has shown that the compound not only boosts muscle power and recovery but also offers cognitive benefits.

“There is some evidence to suggest that using creatine can significantly enhance cognitive performance when taken alongside coffee rather than being taken alone,” Barker says.

Caffeine can make certain supplements more effective – these are the ones to have with your morning coffee