Elderflower can help fight colds and flu.
The antiviral properties in elderflower can help calm the effects of colds and the flu virus. Taking elderflower can help clear congested nasal passage, stop running nose or sinus drip, and allergy effects of sneezing and mucus flow. 
Additionally, the use of elderflower can also heal nasal swellings and inflammation. It also gives relief to pains in the nasal passage that are caused by flu. 
Here are herbs to treat respiratory infections.
It can relieve constipation and other digestive conditions. 
Constipation refers to tough and difficult bowel movements. The use of elderflower can help loosen and ease bowel movements. If you take elderflower more often, chances of constipation are also reduced. 
Elderflower can also help relieve other digestive disorders such as indigestion, gas, and bloating. The use of the flowers can calm an upset stomach, give you relief, and ease digestion. 
You may also need to learn;
Elderflower has diuretic properties.
Diuretic properties in elderflower can increase the amount of water and salt expelled out of the body through urine. This helps to clean the kidneys, reduce fluids in the blood vessels, and help to lower blood pressure.  
Boosts the immune system.
Elderflower is packed with vitamins, antioxidants, and anti-inflammatory properties that can make your immune system stronger against bacterial and viral infections. The antioxidants include; flavonoids and vitamin C. The anti-inflammatory properties fight off infections such as the flu virus, respiratory infections, colds, and others. 
Elderflowers can cause relaxation.
Elderflowers most especially when taken in tea can help you to stay calm and relaxed. This can help to reduce stress, relax nerves, and overcome depression. 
The calming effects of elderflowers can also help insomnia by relaxing the body so that you fall asleep much faster. 
Freshen the breath. 
The sweet aroma in elderflowers can help in getting rid of bad breath. It replaces the bad odor with its sweet smell. This is why you will find elderflower in many mouthwash brands. 
The antiviral and antibacterial properties in elderflowers can also fight bacteria that cause tooth decay which in most cases are responsible for bad breath. 
By gaggling, chewing, or taking elderflower tea, you can fight bad breath and promote healthy teeth and digestive system. 
Anti-inflammatory properties.
Elderflower is packed with anti-inflammatory properties that can help fight off inflammation responses by the body. It can fight inflammation of the joints (rheumatism), swellings, and pains.
 
https://knitspice.com/the-7-surprising-health-benefits-of-elder-flowers/