Myvitamins Pre-Workout Shot

£32.99 (box of 12), myvitamins.com

Need an instant energy boost? These shots combine 200mg caffeine and B vitamins, plus 2g beta-alanine and 3g creatine monohydrate. There’s also argininealpha-ketoglutarate (AAKG) to support the production of nitric oxide – and delay tiredness – in the working muscles.