Apparently it was a fat burning substance.
Ironically Sakho was criticised at PSG ( by the president) for being slightly overweight.
He also said when he joined Liverpool that he wants to get bigger and more powerful. He is a bit of a weight freak and broke the equipment there, apparently too strong for it. It had to be reinforced.
'I need to fill out more and bulk up to progress' he said.
Well, there are illegal fat burning substances that will help you do that. They will help build more muscle mass.
Clenbuterol for example.
I would also like to add the Sakho is innocent as nothing has been proven. Therefore any suggestion that he is using banned drugs to build muscle mass in his attempt to become 'more powerful' are just conjecture on my part.