Quercetin with zinc formula. Sandhus Zinc Quercetin is Manufactured with Globally Sourced Ingredients, packed, tested and distributed in the USA according to strict cGMP norms; Each capsule offers 22mg of Zinc & 800mg of quercetin. Refrigeration is not required, the product can be stored in room temperature. There have been no reported side effects associated with this product. There were no reported interactions with other supplements when using this product. However, it is always best to consult your healthcare professional before combining it with other supplements or medications to ensure safety and efficacy. This supplement does not contain any artificial preservatives. There have been no known interactions with other supplements or medications when using this product. However, it is always best to consult your healthcare professional before combining it with other supplements or medications to ensure safety and efficacy. To date, there have been no reported side effects associated with this product. However, it is always best to consult your healthcare professional before taking this to ensure safety and efficacy. Zinc Supplements support skin health through multiple mechanisms. It offers superior absorption with superior bioavailability. Zinc Quercetin provides antioxidant support and helps immune health. It offers excellent value with third-party testing.