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 ( A Beginner's Guide to Glutathione Injections: What to Expect Glutathione Injections Ihya House of Aesthetics Birmingham Glutathione Injections in Denver Onus Hydration Bar Glutathione IV Add On Vitamin Therapy Next Health Subcutaneous Injection: What It Is and How to Give One