Types of injections explained Intramuscular (IM) Inserted at 90 to deliver medication deep into the muscle, allowing relatively fast absorption due to rich blood supply. Subcutaneous (SC) Inserted at about 45 Bacteriostatic Water TNN Peptides B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 Injection Kit: Syringes & Needles & Alcohol Wipes Medbasic Needle and Syringe Combos How Much Bacteriostatic Water to Add to Peptides? Prime Peptides