The normal range of b12 in the blood is 200 - 900 picograms per milliliter. Food with the highest levels of b12 include shellfish and liver.
20 drops for each milliliter.
you can take any quantity from b12 , because safety.
For adults the RDA is 2.4 micro grams
You should take a B12 everyday. Two if your a vegetarian/vegan.
0.2 metric teaspoons
0.001 of one liter
b12 5.0-97 b12 5.7-57
It takes approximately 24 hours for the absorption of vitamin B12. For quicker absorption, you can get a B12 shot.
20 drops per milliliter.