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 Tolerable Upper 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 Tolerable Upper 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. In fact, the amount of at least one of the ingredients in Z-Stack exceeds the Tolerable Upper Daily Intake Level, i.e., it raises the risk of adverse effects. Vladimir Zelenko, MD - a physician known for developing the "Zelenko Protocol" for treating and preventing COVID-19 - does not appear to have been tested in any clinical trial, and there is only preliminary evidence that certain ingredients in Z-Stack may have immune-boosting effects, although not necessarily at the doses in Z-Stack. Z-Stack is a multivitamin marketed as an "all-in-one immune boosting super formula." The vitamin itself, which was developed by Dr.
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