Which of the provided B vitamins is stored only for a few weeks in the body?

Thiamine, also known as Vitamin B1, is water-soluble and is stored in the body only for a brief period, typically a few weeks. Unlike fat-soluble vitamins, which can be stored in significant amounts in the liver and adipose tissue, water-soluble vitamins like thiamine are not stored extensively. The body utilizes thiamine for various metabolic processes, particularly in carbohydrate metabolism and energy production, and any excess is readily excreted through urine.

This limited storage capacity means that a consistent dietary intake is necessary to maintain adequate levels. In contrast, Vitamin B6 and Vitamin B12 can be stored for longer durations. Vitamin B12, for instance, can be stored in the liver for several years. Folate also does not have the same short storage lifespan as thiamine; instead, it can be stored for a longer period in the liver and other tissues. Thus, thiamine's brief storage duration highlights its unique characteristics compared to the other B vitamins listed.