America has a standard for this and I know a little.

But the CFU(colony forming units)of bacteria have to be 100 or less to be considered ok.

In most oil based steroids they tend to be 100 or lower due to the fact that the oil used is not a good place for colonies to form. Also the BA helps to keep this # down as well.

On the other hand steroids that have a water base that were tested had an insanely high CFU of bacteria in them . This is because water is a breeding ground for bacteria and the techniques used to produce steroids in an UGL setting are far from sanitary.

The only time I have ever had a problem was with bad gear.

Most healthy individuals will easily fight of most bacteria that contaminates UGL but know one really knows. You would have to test every cycle.