Source (well his better half) told me that this was a small batch and that future batches would be tested before going out.

A quick look at their websites will show that Mast E is back in stock. I'm very curious as to how testing was done so quickly on this new batch.....

I asked Angus to comment on how masteron has been testing in general.

9 months ago I noticed a startling trend with the Masteron Propionate. The quality of all the mast P was spiraling down and bottomed out with tests consistently reading in the single digits. Mast E was still testing very good though. I advised sources to be wary of the Mast P. In the last 60 days the Mast P has started to improve but there is still an incredible amount of poor quality Mast P around and now I am seeing where the Mast E has followed the path of its brother. I know of one particular case of a source ordering a kilo of Mast E and customs for their country got it, opened it, and after a month released it. There was no masteron in it, therefore it was not illegal. I think I can count on one hand the number of good masteron tests I've seen in 6 months. Just last week I had 8 tests for masteron. I can't guess on the cause of this trend but I know I feel bad for the unsuspecting victims.

I'd advise to steer clear of mast E altogether unless it's one of the very few sources who actually get everything tested, but almost none do. Chances are your source doesn't. I realize this puts a large target on my back but I felt I had to warn you all.... this is messed up