Try elderberry

Elderberry has been used to treat colds and the flu for hundreds of years. After 48 hours, participants in placebo-controlled research who took elderberry lozenges four times a day reported less fever, headache, muscle aches, nasal congestion, and cough.

60 people with flu-like symptoms who took 15 millilitres of elderberry syrup four times a day improved four days sooner than those who received a placebo, according to a different study. In a bigger study with 312 air travellers, it was discovered that elderberry extract 300 mg capsules, taken three times a day, significantly decreased the intensity and duration of cold and flu symptoms in comparison to a placebo group. Elderberry syrups, lozenges, and capsules can be purchased offline or online. Elderberries should not be consumed uncooked since they may cause nausea, vomiting, and diarrhoea. Keep in mind that elderberry is an additional therapy, so make sure you're also taking over-the-counter or prescription medicine to treat the flu.