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Even if the solution appears clear, bacterial contamination that is invisible to the eye can develop after 28 days

10.1080/19490976.2023.2166700 Gut Microbes

doi: 10.3390/cells12101359 55 HadjiaggelidouCKatodritouE
Observation of 30 cases on modified huangqi guizhi wuwu decoction in treatment of diabetic neuropathy with pain

Animal studies show no toxicity even at doses 1,000 higher than typical use, but that doesn't mean high doses are risk-free in humans (Sikiric et al., 2014)

Threatened abortion: a risk factor for poor pregnancy outcome, a population-based screening study
