Crystal methamphetamine (crystal meth) speeds up HIV replication in both test tube studies and in specially bred HIV-infected mice, according to a study published in AIDS Research and Human Retroviruses.

The connection between crystal meth use and HIV transmission has been well established by researchers—people using the drug are more likely to become infected with the virus, or transmit it onward. Studies have also documented more substantial brain damage and cognitive impairment among HIV-positive meth users, compared with people living with HIV not using the drug.

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