Keep some peppermint essential oil on hand! German researchers found the smell relieves allergy symptoms as effectively as many over-the-counter decongestants and antihistamines. It’s down to the cooling menthol in mint, which relaxes arteries and muscles, and shrinks mucus membranes, making it easier to breathe! So, when your allergies flare up, add a few drops of peppermint oil to a pot of boiling water. Then, don’t burn yourself! But lean your head over the steam and inhale deeply for 5 minutes. Your sinuses should unclog in no time.