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For instance, as red blood cell production accelerates (typically beginning 3-5 days after treatment starts), iron stores may be utilised more rapidly

But they can occur

[4] However, consistently taking large amounts of vitamins from multiple sources could potentially increase the risk of side effects (for example, very high vitamin B intake from multiple supplements over time can cause neuropathy, and high niacin from many sources could affect your liver)

Vitamin B12 deficiency has been linked to extreme tiredness lack or energy cancer cardiovascular disease, dementia decline in cognitive function nervous system damage anaemia mouth ulcers mental health conditions visual problems