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Nakanishi H, et al
Also supports collagen production and joint health

Effects of acetyl-L-carnitine and methylcobalamin for diabetic peripheral neuropathy: a multicenter, randomized, double-blind, controlled trial

The upper safe limit for zinc intake in the UK is set at 25 mg per day from supplements, according to guidance from the Expert Group on Vitamins and Minerals

Total symptom score decreased significantly compared to placebo across treatment groups of all doses 600-1800 mg/d oral ALA, yet there was a dose-dependent increase in nausea, vomiting, and vertigo, and therefore the lowest dose of oral ALA (600 mg/d) is recommended
