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Nature , 432 (7016), 466472

Subcutaneous Injection Needles: Gentle Delivery to Shallow Tissue Subcutaneous injection delivers medication between skin and muscle layers, ideal for drugs requiring gradual absorption

These may include rash, facial swelling and breathing difficulties

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Adding to doctors' worries are concerns about purity and dosing, because users typically buy from websites selling unregulated Chinese product some of which comes from plants that previously produced the deadly opioid fentanyl

I am delighted with the result