The GI side effects can generally be reduced by taking quercetin with food. Side effects of quercetin are uncommon but may include mild nausea, stomach upset and/or headache. It's also unclear if taking quercetin supplements can help prevent or treat COVID-19 or what dosage would be effective. Although there is evidence that quercetin may help reduce upper respiratory tract infections after exercise, it is unclear if quercetin helps reduce the risk of colds. Z-Stack provides 500 mg of quercetin per serving. For this reason, if you are taking more than 40 mg of zinc daily, it's generally recommended to also take some copper (about 1 to 3 mg daily), which Z-Stack does not contain. Getting too much zinc can interfere with copper absorption, which might suppress the immune system and cause other serious side effects. However, the dose of zinc in Z-Stack is close to the upper tolerable daily intake level for zinc, which is 40 mg daily. Zinc supplements cause few side effects other than mild stomach upset or unpleasant taste. Although zinc lozenges have been shown to reduce cold symptoms, effectiveness appears to require a sufficient amount of zinc (as zinc gluconate or zinc acetate) taken as a lozenge so it can dissolve in the throat, where it is believed to act directly - not as a capsule, as in Z-Stack. In such people, supplementing with zinc (e.g., 20 mg per day, which is similar to the dose in Z-Stack) may help increase immunity and reduce the risk of respiratory tract infections. Taking zinc is not likely to provide immune benefit for most people unless they are deficient in zinc, which is more common in elderly people, vegetarians, and those taking certain medications. Z-Stack provides 30 mg of zinc (from 130 mg of zinc sulfate) per serving. Preliminary research suggested that supplementing with moderate- to high-dose vitamin D when vitamin D levels are low may improve prognosis in people hospitalized with COVID-19, but there appears to be an increased risk of COVID-19 in people with very high levels of vitamin D, as could be caused by the amount of vitamin D in Z-Stack. Since low blood levels of vitamin D have been linked with a greater risk of infection and more severe symptoms and complications of COVID-19, there has been interest in vitamin D supplements to reduce these risks. However, vitamin D supplements are not beneficial for colds in people who already have adequate levels of vitamin D. Research suggests that vitamin D may help reduce the occurrence of colds and upper respiratory infections in people without adequate blood levels of vitamin D. Above this level, the risk of harm increases, including the risk of hypercalcemia (too much calcium in the blood), which can cause constipation, headache, irritability, confusion, weakness, metallic taste, loss of appetite, painful calcium deposits and kidney failure. This is concerning as it is not only way above the adult daily requirement (600 to 800 IU), but also above the upper tolerable daily intake level for vitamin D (which is 4,000 IU for adults). Z-Stack contains 125 mcg (5,000 IU) of vitamin D3 per serving. For people already getting a significant amount of vitamin C from their diet or other supplements, taking Z-Stack may cause them to exceed this level, which may increase the risk of side effects including kidney stones and kidney damage. However, the upper tolerable daily intake level for vitamin C in adults is 2,000 mg - and this includes intake from foods, beverages and supplements. In general, vitamin C is safe when used in moderate amounts, although it may cause diarrhea, heartburn and other GI disturbances. However, there is no evidence that getting more than the daily requirement of vitamin C (75 to 120 mg daily) can prevent infection from coronavirus, and clinical studies have not shown a clear benefit from giving high-dose vitamin C to COVID patients. Vitamin C supplements have been promoted by some websites to help fight viral infections other than colds, such as COVID-19. However, taking vitamin C does not seem to prevent colds unless you're deficient. There is evidence that vitamin C may reduce the duration and severity of colds during cold season when taken in slightly higher doses (usually 1 gram daily) prior to getting sick. Z-Stack contains 800 mg of vitamin C (as ascorbic acid) per daily serving. Since the exact ingredient combination in Z-Stack does not appear to have been tested in a clinical trial, we've reviewed the amounts of each of its ingredients for potential safety and immune benefit. What ingredients are in Z-Stack and are they beneficial?Īccording to the product label, Z-Stack contains vitamin C, vitamin D3, zinc and quercetin.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |