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For example:
* normal vitamin A intake supports health, while excessive preformed vitamin A can injure the liver
* vitamin D is essential, but extreme supplementation can raise calcium and damage the kidneys
* iron corrects iron deficiency, but excess iron can damage organs
* niacin is a vitamin at normal dietary doses but acts more like a medication at high doses
This is why supplement labels should never be interpreted as meaning that taking several times the recommended amount will produce greater benefits.
## Combining Supplements Can Accidentally Increase Your Dose
People sometimes take:
* a multivitamin
* a “hair, skin and nails” product
* an immune supplement
* a separate vitamin D product
* an energy supplement
without realizing several products contain the same vitamins.
That can unintentionally push the total daily intake far above recommended amounts.
Before starting several supplements, compare the labels and calculate the total amounts of overlapping nutrients.
## People With Liver or Kidney Disease Need Extra Caution
If liver or kidney function is already reduced, the body may process or eliminate certain substances differently.
