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Why is the recommended dosage of B12 drops relatively high?

Vitamin B12 requirements are increased by harmful environmental factors, stress, sport and poor nutrition. 
This is why our daily recommendation is so high. Unfortunately, despite its high bioavailability, only a small proportion is metabolized by the body. 
This is due, for example, to the fact that in many cases the intestinal flora is not in balance, which inhibits its utilization. 
In addition, vitamin B12 is a water-soluble vitamin, which means that any excess is simply excreted again (e.g. through sweating).

Even if B12 is taken in very high doses, only around 1.5 µg of vitamin B12 can be absorbed via active absorption. 
An overdose is therefore not possible, as the body works in a quasi self-limiting way. 
In addition to active absorption, there is also passive absorption. In this context, our B12 is specifically dosed very high: 
With passive absorption, vitamin B12 can also be absorbed via the intestinal mucosa without transporter proteins and is therefore ideal for people with a vitamin B12 absorption disorder. 
Unfortunately, only 1% of the amount consumed can be absorbed via this route, which is why a higher initial dosage makes sense here.

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