A concentration-enhancing drink contains, in each case independently of one another, per liter: 1 mg to 10 g, preferably 1 to 1000 mg, still more preferably 10 to 500 mg, in particular 50 to 300 mg, of epigallocatechin gallate 1 to 500 mg, preferably 10 to 100 mg, in particular 20 to 80 mg, of nicotinamide ribose and/or 0.05 to 10 g, preferably 0.1 to 5 g, in particular 0.5 to 3 g of tryptophan.
