glutathione skin lightening drip Warning issued over IV drips for in salons IV Drip for Skin Lightening
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The animal science is real, but calling it 'proven' is a stretch when 99.7% of the research is in rats

& Wierzbicki, A

doi: 10.4187/respcare.04209

Ferreiro AL, Choi J, Ryou J, Newcomer EP, Thompson R, Bollinger RM, et al

10.1007/s12011-014-9950-6 116 YangY

The angle depends on how much fat there is at the site, which is why technique is judged case by case rather than by a fixed rule
