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 Is It and How to Give One Ro Glutathione Injections Redondo Beach Why Is Glutathione Added as a Push? Glutathione IV Power Subcutaneous Injection: What It Is and How to Give One