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 ( Injectable Glutathione Glutathione Injections: Benefits, How It Works & Telehealth Modern Endocrine Glutathione IV Add On Vitamin Therapy Next Health IM Injections Revive at The Group Med Spa How To Give a Subcutaneous (SubQ or SQ) Injection OncoLink