Those liquid vitamins are marketed more for soaking than ingestion. The skin doesn't let much through besides just plain water and air. The digestive system can absorb some water-based nutrition, but most that is dissolved in water passes right through and is filtered out by the kidneys. The small intestines have these finger-like projections called villi that absorb enzyme-saturated food particles and process most nutrients. Water is primarily absorbed through the large intestine which does extract some of the B vitamins and the electrolytes but not most other nutrients. Even the electrolytes are better utilized by the body when processed by the small intestine.
Vitamins are generally recommended to be taken with food so they will combine with food particles and maximize the ability of the small intestine to absorb them. That's one reason why liquid calcium is usually sold in a heavy corn syrup base, that way it requires digestion and doesn't just slide right through to the large intestine.
Young mammals and some birds can extract vitamins effectively from water but reptiles never go through a liquid diet phase in the development of their digestive system.
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