Question

Why is there no enzyme to digest vitamins?

Answer 1

Vitamins are vaguely defined chemicals: they are nutrients that are required in small amounts, but cannot be sufficiently synthesized by the body.

Because they cannot be synthesized, there's no reason to break them down; that would actually be counterproductive.

Nevertheless, vitamins definitely can be broken down in lysosomes, and this probably is particuarly important in cases where you overdose on vitamins (though the kidney is probably far more important for water-soluble vitamins).

An important thing to note about vitamins is that what is a vitamin for one organism is not a vitamin for another; after all, the vitamin must be synthesized somewhere. And if it can be synthesized, it's not a vitamin.

Answer 2

Vitamins are used in their original form by the cells.They do not require enzyme for digestion because they are absorbed directly from the digestive tract and transported by the blood to the cells.