l carnitine injectible L‑Carnitine Injections L-Carnitine: Boost Energy & Performance
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[DOI] [PMC free article] [PubMed] [Google Scholar] 103.Bar-Or D, Curtis G, Rao N, Bampos N, Lau E

These may show up on the elbows, knees, scalp, lower back, or behind the ears

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However, the difference between them is that in opioid tolerance, an increased amount of opioids is necessary to relieve the pain, whereas in OIH, the same amount of opioid causes paradoxically worse pain
