Btw I haven't figured out how to purchase supplements. Is it worth at this stage? And should I have my boys "vending"?
since sydney has no supp company, youll have to go to "highstreet" (link on the right) go to any other city (look for a legit supp company with ratings and proof their supp are really the quality they claim) and buy the supplements there with your manager. because its in a different city it will take 3 days to get to your fighter. if it were same city, it would be instant.
now when you buy the supplements they will be under the "possessions" link. scroll down to your fighter, and check off the supplement you want to use. you can only use one at a time, and certain supps only work with certain training activities. muscle bulk (strength) should only be taken when you have your training set to "weights". "stamina increase" only works when you have your fighter doing cardio. energy loss supps work for all training...weight gain and loss work with all training.
if you feel a fighter is a good one, and promising yeah its absolutely worth it. all the top fighters in the game are stacked with supps. (but yeh youll also need money for the good ones haha)