Which characteristic is true for water-soluble vitamins?

Water-soluble vitamins are indeed not stored in body tissues; instead, they are readily absorbed into the bloodstream and utilized by the body as needed. This characteristic is important because it affects how often individuals need to consume these vitamins to maintain adequate levels. Unlike fat-soluble vitamins, which can be stored in the liver and fatty tissues for longer periods, water-soluble vitamins such as vitamin C and the B-complex vitamins are not retained in significant amounts. As a result, excess quantities of water-soluble vitamins are excreted through urine. This means that a regular intake through diet is essential to avoid deficiencies.

The distinction between water-soluble and fat-soluble vitamins also has implications on toxicity; for instance, while fat-soluble vitamins can accumulate to harmful levels, the risk of toxicity from water-soluble vitamins is generally lower due to their constant elimination from the body.