IV Therapy In Washington D.C., Intravenous (Infusion) therapy Glutathione 30 dose Self Injection Kit (with optional Vitamin C) 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 ( How to Give Yourself an Intramuscular Injection Which Body Area Is Best to Inject Glutathione?