Well you have Dabo saying this...
"This particular substance can come from anything," Swinney said. "And these three players have no clue -- in fact, they thought it was a joke when I called them. They have no clue how this has gotten in their system. It could come from hair products. It could come from a cream. It could come from protein. It could come from a product that you order or buy online that you think there's nothing wrong with it. It could be anything. Literally, it could be a drink -- something in a drink."
Then you have this on the Anti-doping agency website...
Do everyday products contain ostarine?
There are in fact products that contain ostarine, but only illegal ones. Given that ostarine is not approved for human use or consumption in the U.S., or in any other country, there are no legal medications that contain ostarine.
It’s also important to note that ostarine is not a permitted ingredient in dietary supplements. However, you should be aware that some dietary supplement manufacturers illegally put SARMs like ostarine in their products and sell them as “legal steroids” or “research only” chemicals.