However, both forms have been used in fertility studies with positive results
Micronutrient status was not measured systematically, so low reported rates of nutrition events do not establish nutritional adequacy
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A deficiency or lack of Vitamin B12 is quite common in the over 65s, those diagnosed with pernicious anaemia, and in anyone who follows a vegan, strict vegetarian, or extreme/fad/restricted diet for a long time without taking a B12 supplement or eating fortified foods