UK soil selenium deficiency and its implications Selenium levels in UK soils have dropped steadily over 30 years [22]
The role of cytochrome P450 enzymes in endogenous signalling pathways and environmental carcinogenesis
International Journal of Cardiology
Needs vary from one person to another yet, for information purposes, here is the recommended daily vitamin B intake for women and men: Vitamin B deficiency can cause many different symptoms: digestive disorders, skin issues, anaemia, fatigue, as well as neuropsychiatric disorders
A small percentage of Hb is always auto-oxidized under normal physiological conditions resulting in the presence of metHb in blood, but metHb can also be present due to genetic abnormalities, exposure of red cells to certain drugs or toxins, or due to a deficit in antioxidants