The vitamins A, C, D, E, B6, B12, folate, and the minerals selenium, zinc, copper, and iron, are essential for normal immune function. Dietary supplements are highly in demand to boost immunity and prevent deficiencies in these nutrients.Dietary supplements and their raw materials are diverse, from an extract in a tablet to a tea packet, milk, or oil bottle in the kitchen. Producers and regulators ensure that active compounds are present in these supplements at the levels expected. Geographic origin, freshness, and production-type can affect health benefits also require testing. LC and GC methods focus on known compounds of importance with many outlined by reference bodies like IOC, ISO, FSSAI, and USP.
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