Which nutrients can be absorbed without first being digested in the human gastrointestinal tract?

Monosaccharides (such as glucose and fructose), amino acids, fatty acids, vitamins, and minerals can be absorbed without first being digested in the human gastrointestinal tract. These nutrients are small enough to pass through the lining of the small intestine directly into the bloodstream. This process is facilitated by specific transport mechanisms for each type of nutrient. However, larger molecules like disaccharides and proteins require digestion by enzymes before they can be absorbed.