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Vitamin C, or ascorbic acid, is a vital substance that the human body is unable to produce on its own. Therefore, it needs to be supplied by external sources such as food. Vitamin C supports white blood cells and thus stimulates the immune system, reducing the risk of infection. Furthermore, cell protection is enhanced due to the binding of free radicals. In studies investigating the prophylactic use of vitamin C in ultramarathon runners, children and Canadian soldiers, the prophylactic intake of vitamin C reduced the frequency of a cold by about half compared to a placebo.
(Source: European Journal of Clinical Nutrition: https://www.ncbi.nlm.nih.gov/pubmed/16118650)

Zinc supports the absorption of vitamin C and is one of the most important trace elements most notably in overall metabolism, as it is involved in the function of more than 200 enzymes. Additionally, zinc supports immune system functions. In the case of increased fluid loss, for example caused by sweating due to a fever, a loss of zinc can occur. (https://www.ncbi.nlm.nih.gov/pubmed/22429343)
Findings showed that zinc has a regulating effect on the so-called innate immune system, forming a first line of defence against pathogens.
(Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666901/)

In many cultures, ginger root is known for its healing and beneficial effects containing antioxidants that strengthen the immune system. The spicy root has been used in traditional Chinese and Indian medicine for centuries.
Ginger is anti-inflammatory, it stimulates intestinal activity and laboratory tests have confirmed its effectiveness against various viruses.
It is used with positive results, especially for colds, nausea and pain relief. The so-called medicinal plant definitely has pain-relieving properties: studies confirm that the ingredients of ginger inhibit the same enzyme as acetylsalicylic acid, which is an active ingredient for relieving pain and inflammation. Various experts from international research have attributed pain-relieving effects to ginger.
(Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3665023/)