Sharing a needle or syringe to inject any substance (including steroids, hormones or silicone) puts you at risk of HIV and other infections found in the blood, like hepatitis C. You’re at risk whether you’re injecting under the skin only or directly into your bloodstream.
The research states that medical error comes in next right after deaths caused by heart diseases and cancers (the later two causing at least 250,000 deaths every year).