Creatinine is transported through the bloodstream to the kidneys. The kidneys filter out most of the creatinine and dispose of it in the urine. Because the muscle mass in the body is relatively constant from day to day, the creatinine production normally remains essentially unchanged on a daily basis.
When you have an upset stomach, avoid acidic foods, he says. 1  Fatty Foods Fatty foods stimulate contractions in the digestive tract, which, surprisingly, can either slow down the emptying of the stomach and worsen constipation or speed up movement and worsen or lead to diarrhea.
Stomach upset is a common multivitamin side effect, however. The severity of the stomach upset may vary from mild nausea to severe cramping and could occur within minutes of ingestion. Although an upset stomach from multivitamins is common, you can avoid or reduce the severity of the problem by taking your vitamins with food. Choose a multivitamin without iron, unless directed otherwise by your doctor. Multivitamins with iron are more likely to cause an upset stomach.