Which essential vitamin, vital for immune function and collagen production, is found in significant amounts when consuming a medium raw onion?
Answer
Vitamin C
Onions, even while being low in calories, offer a decent delivery of several essential vitamins and minerals. Among the key vitamins specified, Vitamin C stands out due to its specific biological functions. Vitamin C is considered vital because it plays an indispensable role in supporting robust immune function within the body. Additionally, it is necessary for the synthesis and maintenance of collagen, a critical structural protein. While other nutrients like B6, folate, and potassium are also present and important for metabolism, fluid balance, and cell function respectively, Vitamin C is singled out for its contributions to immunity and collagen production.

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