What do people mix herion with?

People often mix heroin with various substances to enhance its effects or alter its appearance. Common adulterants include cutting agents like sugar, starch, or powdered milk, as well as other drugs like fentanyl, cocaine, or methamphetamine. These mixtures can increase the risk of overdose and other health complications, as users may be unaware of the potency or presence of dangerous additives. Mixing heroin can lead to unpredictable effects and is extremely hazardous.