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: What It Is and How to Give One Why Is Glutathione Added as a Push? Glutathione IV Power Glutathione Injections Redondo Beach A Beginner's Guide to Glutathione Injections: What to Expect Subcutaneous Injection Sites and Instructions for Safe Self Administration