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Testosterone base (often called testosterone suspension) is a fast-acting form of testosterone that contains no ester, meaning it is immediately active after administration. It is typically suspended in a carrier solution such as PEG/MEG to allow injection.
Because it is pure testosterone, it acts quickly in the body and can also aromatize to estrogen, which may require management in some contexts. The carrier oil is used to help deliver and stabilize the compound for injection.