In more detail, the word isotonic means same pressure, which in this case, is referring to the same osmotic pressure as bodily fluids. This includes tears, plasma in the blood, sweat, saliva and other bodily fluids. Everything you ingest must be made into an isotonic solution before it can be absorbed by the small intestine. This process involves gastric acid being secreted into the food, along with stomach muscles contractions, until a uniform isotonic solution is made. This shows that digestion takes a while because this is only step one.
When you take an isotonic vitamins it is already the same as your bodily fluids. So therefore, the first step can be shortened and isotonic vitamins can get to the small intestine quicker and be absorbed within minutes. The main reason this occurs is due to biological sensors, that can tell when the ingested isotonic vitamin have attained the best level of acidity to match the body. Therefore, it becomes an isotonic solution. The sensors prompt the muscle between the stomach and intestines to open and allow the isotonic vitamin solution to pass through.
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