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This is often due to limited dietary intake, malabsorption, medical conditions, or the use of B12-depleting medications ( Vitamin B12 deficiency is determined as follows ( Because the ability to absorb B12 from food declines with age, deficiency is more common in older adults
This idea is supported by work that shows some genes that drive cancer growth turn on other genes that make intrinsic antioxidants
A., Miller R
The primary effects don't overlap much, so you're getting additive benefit rather than redundancy
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