Which compounds in onions are proponents thought to help the body fight off viral challenges when combating sickness?

Answer

Sulfur-containing compounds.

When individuals are actively seeking to utilize onion water for symptom management, the focus shifts toward leveraging the onion's established nutritional profile. Specifically, the sulfur-containing compounds present within the onion are the components most frequently cited by proponents. These elements are widely recognized in nutritional contexts for their positive contributions to a healthy diet, and in the context of folk remedies for illness, they are specifically hypothesized to possess properties capable of aiding the body's internal defense mechanisms against viral invasions or challenges.

Which compounds in onions are proponents thought to help the body fight off viral challenges when combating sickness?
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