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Kalamkar S, et al

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Glutathione Injections : For maximum bioavailability, intravenous glutathione injections offer direct absorption into the circulatory system, bypassing the gastrointestinal limitations of oral forms

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In contrast, GHK-Cu treatment reversed these alterations

Intravenous administration of lipoic acid at doses of 600 mg/day for three weeks (112) and oral lipoic acid at doses as high as 1,800 mg/day for six months (113) and 1,200 mg/day for two years (76) did not result in serious adverse effects when used to treat diabetic peripheral neuropathy