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Depending on your symptoms, you may be referred for a blood test for assessment, to determine the most effective, required and safest dose of vitamins and minerals

J Neurosci Res 6: 719722

10.1038/s41418-022-01046-4 63 YaoY.XuY.LiangJ.-J.ZhuangX.NgT

It just increases the chance of scalp irritation

Think about it more like a slow improvement, not something that happens overnight
