My allergies used to keep me trapped inside during the grass and tree pollen season. Now I can hike all day!
This study compared allergy symptom reduction in grass allergies of children (many people call their grass allergy hay fever) when taking allergy drops year round versus taking the only during grass pollen season.
While both treatment schedules were effective, the researchers wrote "Conclusion: In grass pollen allergy, the continuous regimen performs better than the coseasonal in the first season, whereas in the subsequent years, the two regimens are nearly equivalent.
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