One well-documented interaction is with certain anti-epileptic drugs: high-dose pyridoxine may reduce the plasma levels of phenytoin and phenobarbital by enhancing their hepatic metabolism, potentially diminishing their anticonvulsant efficacy
50% of the bodys storage of vitamin B12 is kept within the liver, no matter how it is administered, so if the liver is sick, in all likelihood, a person can suffer B12 deficiency
PMC 7601760
Check for blood by aspirating
The scalp faces particular exposure from UV radiation, environmental pollutants, and metabolic byproducts
Some drugs, such as the diabetes medication metformin, are excreted through the salivary glands and wind up in your saliva, so you taste them, and they often taste bitter