caffein depletes glutathione Alcohol Metabolism Rate: How the Body Processes Alcohol Coffee Consumption and Oxidative Stress:

A high degree of polymorphisms within the gene encoding an NTHi haemoglobin-binding protein has been reported, which alters the protein affinity for iron capture/usage (Whitby et al., 2009)

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For example, adults over 60 are more prone to deficiency due to decreased stomach acid production

Capsules can be effective if they contain high-quality, standardized extracts, but resin is preferred for maximum bioavailability