Vitamin B12 injections: Facts to keep you safe Cosmedica Injecting substances can expose individuals that use injection drugs to serious harm, but understanding the difference between safer and more harmful sites can help reduce these potential dangers. Here's a breakdown of B12 shots for weight loss: Do they work, risks, benefits, and more Lovenox (enoxaparin) Explained Low molecular weight heparin (LMWH) Used to prevent blood clots Administered SUBQ, typically in the abdomen Educate on signs of bleeding Doesn't require routine lab monitoring Used with caution in B12 Deficiency: Still America's #1 Missed Diagnosis