Garlic
When consumed, garlic can act as an antibacterial agent, reducing the severity of the common cold and influenza, and alleviating its risks and symptoms. The allicin within garlic acts similarly to a spicy food which clears up the nasal passageway. Moreover, garlic has some anti-inflammatory compounds that clear up the nasal passages for the mucus to pass through. Garlic is also known to boost the immune system, which helps to fight off the common cold and influenza.
There is no known risk when consuming a large amount of garlic. Like ginger, garlic also has a chance to inhibit blood clots, which could particularly become a problem with people who are undergoing surgery or are currently recovering from a wound. Anticoagulants and blood thinners should also be avoided because garlic might exacerbate the blood thinning effect. A trivial side effect of garlic is that it can cause bad breath if consumed regularly. Along with this, acid reflux and digestive issues can occur if eaten in large amounts.