Theres no downtime required

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I have completed 3 weeks of the first vial and the results have been fantastic
(April 2012)
B12 is an essential nutrient, and its deficiency is common, especially among individuals following restricted diets like vegetarianism or veganism, pregnant or breastfeeding women, older adults, those who have undergone gastrointestinal surgery or have gastrointestinal disorders, and people with an autoimmune condition known as pernicious anaemia
Some of the signs here are very familiar and are frequent side effects of FIP