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It’s called “base” because, and again this is a few reasons, either its d,l-amphetamine base (as in, not the acidic sulfate form), which the amphetamine base is a oil at room temp, so then glucose is added to make it more of a solid transportable/easily to dose form. From my experience, but this is hit and miss, when it is called “base” it is generally a hype/sales tactic and not indicative of the quality of the source at all.