Head trainer advised him to take VitaD and is as surprised as anyone of what was in the bottle McKay took. Wouldn't be surprised the trainer had him on ivermectin as a precaution either (just referring back to someone's comment earlier in this thread about how VitaD isn't proven to help with immunity). Point is, we don't know if McKay was referred to this product BY the trainer but if he had checked with the trainer he'd have gotten the go-ahead. The miniscule amounts are meaningless. I think this is bad luck on his part and a cautionary tale to most athletes....don't take supplements unless there's real scientific evidence backing up a product. And I'm not talking about "do your own research" scientific evidence. Real stuff.
I'm no apologist for doping. I'm a big fan of road cycling and there's a sport that has a terrible history with doping and all kinds of stories of "it was in my supplement, I had no idea!". But those stories typically don't have the same details here (teensy amounts, same lot tested, etc.).
I'm happy to criticize any athlete who's doping. I just can't get worked up over this one.