I am new at this but a blood test gives results of what is currently in blood stream. I could only find the 1000mcg Methylcobalamon ( important to use this form!) at my store. Have them ordering the 1/5 mg tabs. Heard that hard to get to high on a reading since it is water soluble. Empty stomache very important. I need to know if I should chew them or swallow??? I am going to start with 5,000 mcgs daily. I may take some AM and noonish. Any feedback enjoyed! I wonder if there are all kinds of crazy viruses that docs do not know of that are causing so much PN?