How To Give A Subcutaneous Injection And Sites The HCG Institute Glutathione Injectable Formats Explained Eden Intramuscular vs Subcutaneous injections what's the difference? At KDR, we often use peptides and wellness injections like NAD, glutathione, and HCG, but they are not all administered the same way. Intramuscular injections ( Subcutaneous Injection Sites and Instructions for Safe Self Administration Subcutaneous Injection: What Is It and How to Give One Ro