what are the effects of too much zinc?
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Yes, if you get too much. Signs of too much zinc include nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches. When people take too much zinc for a long time, they sometimes have problems such as low copper levels, lower immunity, and low levels of HDL cholesterol (the "good" cholesterol).
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Health authorities have set the tolerable upper intake level (UL) for zinc at 40 mg per day for adults. The UL is the highest recommended daily amount of a nutrient. For most people, this amount is unlikely to cause negative side effects (1, 2).
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However, large doses have occasionally been associated with side effects (see Adverse Reactions). Zinc: Signs of acute zinc toxicity (doses > 200 mg daily) include GI pain/cramps, nausea, vomiting, and diarrhea, loss of appetite, headache, lethargy, muscle pains, and fever.
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Study shows link between zinc levels and cardiac health. Summary: In addition to essential metabolic functions, the level of zinc in the body also affects the heart muscle. When oxidative stress occurs, it may be due to a shortage of zinc, which can be determined by examining the heart muscle.
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Zinc deficiency is characterized by growth retardation, loss of appetite, and impaired immune function. In more severe cases, zinc deficiency causes hair loss, diarrhea, delayed sexual maturation, impotence, hypogonadism in males, and eye and skin lesions [2,8,27,28].
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The symptoms usually stop when they stop taking the supplements. Other symptoms of too much vitamin B6 include painful, unsightly skin patches, extreme sensitivity to sunlight, nausea, and heartburn. The daily upper limits for vitamin B6 are listed below.
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Zinc deficiency in humans is caused by reduced dietary intake, inadequate absorption, increased loss, or increased body system use. The most common cause is reduced dietary intake. In the U.S., the Recommended Dietary Allowance (RDA) is 8 mg/day for women and 11 mg/day for men.
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Excessive iron can be damaging to the gastrointestinal system. Symptoms of iron toxicity include nausea, vomiting, diarrhea and stomach pain. Over time, iron can accumulate in the organs, and cause fatal damage to the liver or brain. Toxic cellular effects occur as well.
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Zinc deficiency can impact the many functions of the liver and, in particular the liver's capacity for regeneration. By inducing oxidative stress, zinc deficiency can result in cell and tissue damage by modulating specific signal cascades with resulting damage to enzymes, mitochondria and ribosomal structures.
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Extra copper in the liver overflows and builds up in the kidneys, brain, and eyes. This extra copper can kill liver cells and cause nerve damage. Wilson disease is fatal if untreated. Extra copper can also interfere with how your body absorbs zinc and iron.
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For instance, ingestion of a zinc oxide cream may only cause stomach upset, whereas ingestion of even one penny can cause life-threatening toxicity. If your pet ingests a topical cream containing zinc, you may not need to worry unless it was ingested multiple times or in large amounts.
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Adults who are low on zinc can have hair loss, diarrhea, sores on their eyes and skin, and loss of appetite. It also can affect a man's sexual desire. Talk to your doctor before taking a supplement, though. These issues can be caused by something other than a lack of zinc.
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Side effects of too much protein Most research indicates that eating more than 2 g per kg of body weight daily of protein for a long time can cause health problems. Symptoms associated with too much protein include: intestinal discomfort and indigestion.
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Long-term use of zinc, especially in high doses, can cause problems such as copper deficiency. Zinc may interact with drugs, including antibiotics and penicillamine (a drug used to treat rheumatoid arthritis). Vitamin C does not prevent colds and only slightly reduces their length and severity.
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Easy to Overeat Overconsumption of gummy vitamins may put you at risk of getting too much of certain nutrients, especially if you also eat foods already fortified with vitamins and minerals. This could result in vitamin or mineral toxicity, which can harm your body (20).
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Magnesium helps your body regulate its zinc levels, while zinc enables it to absorb magnesium more efficiently—it will only hinder absorption when taken in abnormally high doses (around 142 mg of zinc per day).
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Zinc — especially in lozenge form — also has side effects, including nausea or a bad taste in the mouth. Many people who used zinc nasal sprays suffered a permanent loss of smell. For this reason, Mayo Clinic doctors caution against using such sprays.