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If you have just opened your latest order and found the oil inside looks solid, cloudy, or separated, you are not alone. We receive dozens of messages about steroid oil crystallization winter every year when temperatures drop. It looks alarming, but we promise your gear is not ruined.

Understanding Steroid Oil Crystallization in Winter

Why does this happen? Steroid oil crystallization winter events occur because high-concentration products like NPP (Nandrolone Phenylpropionate), EQ (Boldenone Undecylenate), and Sustanon contain a high amount of hormone dissolved in the oil. When these vials sit in a freezing delivery truck or a cold porch for hours, the low temperature causes the hormone particles to “crash” or fall out of the solution.

This phenomenon is actually well-documented in pharmaceutical science. Research into injectable oil vehicles, such as this study on Virgin Coconut Oil Containing Injectable Vehicles, specifically notes that “the wax formation dispersed in this oil during storage at cool environment makes it not homogenous and opaque.” The study confirms that this is a “problematic behavior” of oil-based solutions exposed to cold—exactly what you are seeing in your vial.

It is the exact same science as honey crystallizing or olive oil solidifying in a cold fridge. The cold changes the physical state, but it does nothing to change the chemical potency or safety of the compound.