ttokkyo has been up and in operation for the past 9 months at least. almost anything you see on the market is relatively fresh (at least in mexico). there are many folks here who swear by their products, especially recent lots, and as far as i know from friends in mexico, the product is legitimate (in mexico, as a vet supplement) and therefore, fairly trustworthy insofar as dosing is concerned.
since the product is produced for "vet" sale, the only remaining question is one of hygiene, but then, i've never heard of someone getting sick off the stuff who could prove forensically that it was the injectable solution (though im sure some might claim to have such proof)...
i for one would not worry about either the dosing, or the hygiene as companies like this actually thrive on good word of mouth from buyers, since they would benefit by not producing underdosed and dirty junk (this is why i believe so many vet products are so big in mexico now) .... early vet companies like brovel had problems with dosing which hurt their reputations, and most of the later generation companies (like ttokkyo) seem to understand this and typically sell stuff that is highly regarded in bodybuilding circles.....
ask around