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The vitamin is absorbed in two ways: Active through a special transport molecule (intrinsic factor) saturated at approximately 1.5g per dose/meal Passive through vitamin B12 that passes through the intestinal wall without a transport molecule maximum 1% of the supplied dosage The real intake is calculated through the combination of these two mechanisms

Have done them three times and will keep using them

Excessive Vitamin B6 can cause nerve damage, while excess Vitamin B12 is typically excreted in urine

Individuals with absorption issues : Some people have trouble absorbing B12 from food or supplements

Then, they get regular doses to keep levels right