Heat the oil. Whether you choose to warm the oil once it's in the syringe barrel under hot waer for a few minutes, or in a heating pad (my preference) or warm the whole vial is up to you. Increasing the temperature to around body temp really makes a huge difference. It allows the oil to slide in quicker, which reducing the time that you can wiggle the needle around, and also reduces the amount of pressure requires to push in the plunger (same deal, less wiggling). Lastly, having injected intentionally cooled oil, room temp and warm oil, I can tell you the chilled is the most painful, followed by room temp.... Heating it reduces PIP, no doubt.
2. Use the shortest needle possible, while still performing an intramuscular injection (avoid the subcutaneous layer, it will hurt). For example, if you are lean you can use a 5/8" needle in you delts, no need for a 1" or 1.5" in my experience. Longer the needle, the more pressure and time required to perform the injection... Which means again, more wiggling. Also, I do believe it causes less tissue damage by penetrating less of the muscle. Having used various lengths in different areas, I have found this to be helpful.
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