The importance and effectiveness of combining different substances is illustrated in the case of vitamins. For example, an easily assimilated calcium preparation is not necessarily absorbed into the system if there is a deficiency of vitamin D, or if the two are not taken together. The body cannot absorb the calcium if there is a lack of vitamin D and, conversely, the vitamin D will not benefit the body if there is a lack of calcium. One complements the other.
In the body we find a similar interdependence of functions. Hydrochloric acid and the digestive enzyme pepsin work in close association with each other in the stomach. Pepsin can break down the food proteins only if the gastric environment is kept acid through the presence of hydrochloric acid in the right concentration; otherwise pepsin is completely ineffective. There are many associations like these, and if we are to produce medicines that fulfil their intended purpose, we must find out more about them.
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