Parasites do definitely suck up your vitamins- and B vitamins need replenishing daily-- so they are most needed to be replenished.
Even flukes suck B vitamins up as well- and B12 is the most common type of B vitamin that is stolen from these worms.
I would also suggest taking some Brewers Yeast daily in your food- it has EVERY B Vitamin in it and is in the correct balance. Also has other nutrients that get robbed.
If you take B12 separately- i'd suggest getting it in liquid form for easy absorption.
Im sure that Tinnutis has some parasite connection. Dr. Hulda Clark
mentions that almost every illness has some link to parasites and metal fillings. I know it definitely has a connection with heavy metal toxicity. Many people with metal fillings still in their mouths get tinnutis, until the metal fillings are replaced, and any existing mercury in the body is chelated out.