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Zinc, a nutrient found throughout your body, helps your immune system and metabolism function. Zinc is also important to wound healing and your sense of taste and smell.
With a varied diet, your body usually gets enough zinc. Food sources of zinc include chicken, red meat and fortified breakfast cereals.
People use oral zinc to help treat colds, but it can decrease the effectiveness of certain drugs and cause side effects.
The recommended daily amount of zinc is 8 milligrams (mg) for women and 11 mg for adult men.
Research on oral zinc for specific conditions shows:
Zinc that's used topically is known as zinc oxide. Zinc oxide cream, ointment or paste is applied to the skin to prevent conditions such as diaper rash and sunburn.
Oral zinc supplements might benefit people with low levels of zinc. Taken soon after cold symptoms appear, zinc might also shorten the length of a cold.
However, don't use intranasal zinc, which has been linked with the loss of the sense of smell.
Oral zinc can cause:
When oral zinc is taken long term and in high doses it can cause copper deficiency. People with low copper levels might experience neurological issues, such as numbness and weakness in the arms and legs.
The National Institutes of Health considers 40 mg of zinc a day to be the upper limit dose for adults and 4 mg of zinc a day for infants under age 6 months.
Don't use intranasal zinc. This form of zinc has been linked with the loss of the sense of smell.
Possible interactions include:
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