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| | Indican |
 | | The Indican test uses a urine sample to test for the presence of indol, a metabolic byproduct of the action of intestinal bacteria on the amino acid tryptophan. |
 | | The indican scale measures the presence of indol, a metabolic byproduct of the action of intestinal bacteria on the amino acid tryptophan. |
 | | Insufficient gastric hydrochloric acid, insufficient digestive enzymes, adverse food reactions, parasitic infection, fungal infection, overgrowth of bacteria that metabolize specific proteins, hypermotility of the small intestine, or other gastrointestinal dysfunction can compromise protein digestion. |
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