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10.1016/j.ymgme.2012.02.007 6 HanL.WangF.WangY.YeJ.QiuW.ZhangH.et al (2014)

This is called the gate control theory of pain, and it has solid scientific backing

Li Q, Liao J, Chen W, Zhang K, Li H, Ma F

If that warrants for the magic oil status it enjoys, we don't know

doi: 10.1016/0021-9150(81)90002-2

Polymeric particulate technologies for oral drug delivery and targeting: a pathophysiological perspective