'I tried Novak Djokovic's 'magic potion' to see just how big the boost is'
!['I tried Novak Djokovic's 'magic potion' to see just how big the boost is'](https://i2-prod.mirror.co.uk/sport/football/news/article33210092.ece/ALTERNATES/s615/0_i-tried-sila.jpg)
The tennis star has been pushing a new supplement that he believes has "enriched" his lifestyle - but how did it fare when I tried it to boost my workout?
The tennis star has been pushing a new supplement that he believes has "enriched" his lifestyle - but how did it fare when I tried it to boost my workout?