B12 is stored in the liver for future use. This is why there is a delay in deficiency symptoms when stomach acid fails. People use these stores when B12 is not in the diet or being absorbed normally. It is thought this storage can last up to 5 years under good conditions.
Folate can be stored in the liver for short periods in amounts approximately of 7mg.
Vit C and other B's can be stored for short periods in the body. Some B6 is stored in muscles as pyridoxal. (liver and kidney are the two most common storage places for C and other Bs.)
Excesses that the body does not need are excreted thru the urine, of the water soluble vits. (B's and C). How much depends on the dose taken, and how much the body needs at that time.
Urinary excretion for water soluble vitamins prevents long term toxicity from developing. However if a person consumes more than 500mg of B6 a day, this may become toxic inspite of the urinary excretion. There is no known toxic dose for B12.
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Weezie looking at petunias 8.25.2017
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