When seasonal allergies hit, most of us will do almost anything to stop the torment.
Starting in mid-August and lasting until the first freeze ragweed is the main cause of misery. But also all year round, dust mites and pet dander cans cause allergies. The result is runny nose, itchy eyes and throat.
The way most allergy medications work is to temporarily relieve symptoms. The way pollen blockers work is to stop pollen from reaching nasal membranes and lungs. This is accomplished by applying a cream, gel or petroleum jelly to the nasal openings to trap pollen. Some of the creams or gels form a positive charge that acts like a magnet to trap negatively charged pollen grains. Chloraseptic Allergen Block Gel, Dr. Theiss Alergol Pollen Blocker Cream and Pronatura Pollen Blocker Cream are three products that block pollen.
I have paraphrased two studies, one that discusses pneumonia due to petroleum jelly being applied around nose area. The other says that pollen blockers can be useful. I have not tried these products personally, it would be best if you made your own conclusions based on these findings. To read more about pollen blocker trials and findings . . .