The range accounts for the 25 to 35% sublingual bioavailability variation
In the randomized placebo-controlled HOME trial of 390 adults with type 2 diabetes (de Jager and colleagues, Long term treatment with metformin in patients with type 2 diabetes and risk of vitamin B-12 deficiency, BMJ, 2010), metformin lowered serum B12 by a mean of 19 percent over 4.3 years
Heres how to get more B12: Eat Animal Products Consumption of animal products such as meat, fish, poultry, eggs, milk, and cheese provide the highest amounts of B12 naturally
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82 , 83 , 89 , 90 , 92 Among individuals of African ancestry who have one copy of e3 and one of e4, those with a particular variant of e3 called R145C are at increased risk of developing Alzheimer's dementia compared with those who do not have this variant