Actimel Mind with Guarana, £1/100g Waitrose

This contains guarana, an Amazonian fruit with caffeinated seeds, probiotic yoghurt, with ‘billions of Lcasei cultures’, and vitamins B6 and D and B5 ‘to support normal mental performance’.

Expert opinion: ‘The guarana provides 50mg caffeine — around the same as a cup of instant coffee, and caffeine is known to boost mental alertness. This bottle will also provide around 15 per cent of your daily vitamin B6, 5 per cent of vitamin B5 and 7.5 per cent of vitamin D — all important for energy and concentration. L’casei cultures can help foster healthy gut microflora, but some will be destroyed by the digestive process.

Taste: Slightly smoky, unsweetened yoghurt flavour.



James White Beet-it Organic Stamina Shot, £1.45/70ml

Made with 98 per cent concentrated organic beetroot juice and 2 per cent concentrated lemon juice. ‘Beetroot is particularly high in dietary nitrate,’ says its maker.

Expert opinion: There is credible scientific evidence to show beetroot juice taken a couple of hours before exercise can help improve muscle efficiency and stamina. A daily dose has also been shown to help lower high blood pressure. Both effects are possibly due to the nitrates in beetroot being converted by the body into nitric oxide, which helps dilate blood vessels and improve blood flow. One shot will count as one of your five a day.

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