THE FRUITY IMMUNE BOOSTER

Gusto Super DC Immune Support Blackcurrant and Elderberry, 250ml, £1.50, sainsburys.co.uk Per 100ml: Calories, 21; saturated fat, trace; sugar, 4.1g; salt, trace CLAIM: ‘Contains high-strength vitamins A, C, D, K and zinc for healthy immune function.’ EXPERT VERDICT: There is no added sugar here (just two teaspoons from fruit juice), and each can will give twice your entire daily requirement of vitamin D (for healthy muscles and bones), in which most of us are deficient.

Otherwise, the high doses of vitamins in this drink concern me. There’s 50 per cent of our daily vitamin A needs in a can, which makes the drink unsuitable for pregnant women and anyone with kidney disease. It also has 2,500 per cent of the daily vitamin C requirement — ingesting high doses regularly can increase the risk of kidney stones.

It contains your daily vitamin K needs, for bone metabolism, but this can interact with some blood-thinning medication. TASTE: Has rather a tart tang — like a blackcurrantflavoured Berocca. 7/10