Hi
For OGS there isn't really a supplement to "speed" the recovery and indeed the most important element is correct and careful loading, adequate rest and working with the coaching and management team to achieve this. Sometimes, shockwave therapy CAN help in more serious cases.
Here is more information if you are keen:
https://sportsmedinfo.sg/condition/osgood-schlatters-and-sinding-larsen-disease/
BW
Dr Dinesh