Most people use 6 oxo in a PCT to rebound Test levels and combat gynecomastia by blocking estrogen receptors after a steroid cycle. I've never used it myself, but I do know that it is very commonly used, and pretty popular, so that alone should tell you that it is safe and effective... or at least effective enough to bring back customers. Using it on it's own would probably do a good enough job in raising your test levels, which is why I assume you bought it. Like I said, I've never used it so I couldn't tell you what the brown coating is all about.
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6-Oxo Extreme 
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