If you are looking for a non-alcoholic drink, there is no shortage of alternatives to lemonade and cola. ‘Functional’ beverages promise mental and physical benefits beyond quenching your thirst and the niche newcomers to the market are nootropics.

Nootropics are a broad category of so-called “smart drugs’ with cognitive benefits. Some are only available on prescription but others you can buy as supplements, and it is these that are also added to drinks.

Some common ingredients you will find in nootropic drinks include the herbs ashwagandha, ginkgo biloba, guarana and chamomile, anthocyanins (flavonoids), enzogenol (pine bark extract), and L-theanine (an amino acid found in black and green tea).

How healthy are they?

The claims are not all hype. Evidence does suggest that the ingredients in nootropic drinks can improve cognitive performance, memory and learning, or aid relaxation, although studies tend to be small with larger studies needed to confirm the findings.

However, benefits are still unclear. Connecting an ingredient to its supposed health benefits can be problematic, says Debbie Fetter, an assistant professor of teaching nutrition at University of California, Davis. Plant-based compounds exist alongside other compounds, and their interactions can boost, neutralise or diminish each other’s effectiveness. She says untangling any single ingredient’s role, and then recreating that effect in a beverage, is difficult.

Too much caffeine can cause headaches, increase anxiety, make you restless and impair your sleep.

Sugar content varies between the drinks too. Some are sugar free, others are low in sugar, while some provide nearly 30 per cent of an adult’s maximum daily sugar intake. It is worth checking the labels if you are looking for a low sugar option.

It is unlikely you will come to any harm with natural nootropics, although medication interactions and health complications are possible, and the long-term effects of regularly drinking them have not been well studied. If you are pregnant or breastfeeding, it is best to avoid them.

Are coffee and tea nootropic drinks?

Yes. Most of us have nootropic drinks every day in the form of tea and coffee. Over 30 per cent of world drinks coffee regularly, while even more drink tea regularly.

Caffeine, found in coffee and tea, is classified as a nootropic because it can increase alertness, energy and concentration. Green and black tea also contain L-theanine, an amino acid that may affect the levels of certain chemicals in the brain, including serotonin and dopamine. These influence mood, sleep and emotion, as well as cortisol, which helps the body deal with stress.