b12 injection subcutaneous vs intramuscular 💉 Angles & Routes of Injections (ID → SC → IM → IV), 🧴 Intradermal (ID), ➡️ Layer: Epidermis → Dermis (very superficial), ➡️ Angle: 📐 10–15°, ➡️ Purpose: TB (Mantoux) test → Allergy testing, ➡️ B12 vitamin Store Intramuscular vs
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