According to 2008 research, your body only absorbs about 1.3 percent of a 1,000 mcg oral dose and 2 percent of a 500 mcg oral dose
Vanessa Mack (Dean) at Infinite Wellness Hormone Specialists determines the recommended frequency of B12 injections based on each patients individual needs, wellness goals, symptoms, health history, and vitamin B12 levels
Some treatment plans start with a repletion phase and then move to maintenance dosing
Going beyond 500mcg rarely provides additional benefit and may increase the likelihood of mild side effects like headaches or injection site reactions
1 Alcohol reduces vitamin B12 levels While there are a number of studies linking alcoholism to severe B vitamin deficiency, the Journal Nature published a study in 2004 that looked at the impact of moderate alcohol intake on B12 levels in post-menopausal women
(One exception to this is vitamin B12