While you should be careful how much vitamin B12 you inject and should discuss appropriate dosage and frequency for you with a trusted healthcare professional, it is practically impossible to have too much B12. The body absorbs animal sources of vitamin B12 much better than plant sources. The US RDA minimum for Vitamin B12 is 2.4 mcg per day for adults, and 2.8 mcg for pregnant or nursing women. Of course, some foods have more B12 than others: The NIH reports that clams are packed with the vitamin at 84.1 micrograms per three-ounce serving, while … Is Vitamin B12 Dosage 5000 mcg Safe? You … As there are so many benefits of taking the Vitamin B12, people want to know how much vitamin B12 should I take? Vegetarians and vegans should consider taking vitamin B12 supplements to avoid developing a vitamin B12 deficiency. Probably less than you think. Should Vitamin D, Vitamin B12, and Magnesium supplements be used as a prophylaxis by healthy persons, in case they contract Covid-19? Yes! The US RDA minimum for Vitamin B12 is 2.4 mcg per day for adults, and 2.8 mcg for pregnant or nursing women. Tell them about the allergies you suffer from and let them decide if you should take the multivitamin supplements or not. Adults (aged 19 to 64) need about 1.5 micrograms a day of vitamin B12. Learn more here. If you are positive for mthfr a good homocysteine reading should be between 7 – 8 µmol/L and vitamin serum B12 levels should be above 500 – 800. Many meat and dairy products have vitamin B12. Doses of 25-100 mcg per day have been used to maintain the B12 vitamin levels in older people. Plant foods have no vitamin B12 unless they are fortified. Limit your B complex supplement to no more than the RDA. This is a reader-friendly overview of Vitamin B12. (Click for more info on optimum levels.) People over 50 years of age should consume vitamin B12-fortified foods, or take a vitamin B12 supplement. Vegans should look for B12-fortified products or take a supplement. But as vitamin B12 is not found naturally in foods such … The animals are able to save vitamin B12 in their body, which passes on. Vitamin B12 is used to treat vitamin B12 deficiency in people with pernicious anemia and other conditions. In Vitamin B12 Deficiency Treatment, getting the RIGHT vitamin b 12 dosage is the key.Unfortunately, doctors will most often give a 'standard' dose of vitamin B12 that effectively corrects the low Vitamin B12 BLOOD LEVEL, but is often not the optimal vitamin b 12 dosage to make individual people FEEL as well as they could be. For pernicious anemia -100 mcg IM/SC once daily for 6 to 7 days. Precautions you need to take while consuming Vitamin B12, B6, and Folic Acid supplements. Before taking the supplements, make sure you consult your doctor. Shellfish is one of the richest food sources of vitamin B-12. More recent studies put the ideal intake at 4-7 mcg per day. Too Much Vitamin B12 Side Effects. 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