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10.3390/cells8040379 Cells 275 YanS.TuZ.LiuZ.FanN.YangH.YangS.et al (2018)

Subcutaneous injections in fatty tissue typically produce a mild sting or sometimes no pain at all

peptides can deliver carriers (such as nanoparticles, extracellular vesicles (EVs), and cells) and cargoes (such as cytotoxic peptides, radioisotopes, and small molecules) to target cells

In other words, sunflower lecithin is not the same as the sunflower oil you'd use in cooking

Warming the solution slightly by holding the syringe in your closed hand for 30 seconds before injecting can also reduce irritation
