I've checked how to reduce the symptoms of pollen allergy.
It seems like that the allergy relates the function of the small intestine which is controlled by parasympathetic nerve(PSN), the initiating factor of allergy (prostaglandin) will be synthesized when PSN works hard for the digestive system. Some usable sources in natural way are,
* avoid to having a big meal on dinner --- PSN predominate at night basically, it needs to work excess if one have a big dinner.
* reduce to take linoleic acid (is high in safflower, soy and corn oil) and increase to take linolenic acid (is high in kiwi, walnuts, flax seed oil)
* taking foot bath 10-15minutes when the lower body is cold --- the lower body is cold = the muscles are cold means the veins around there are cold, too. The blood cool the abdominal area when it get through the area to come back to the heart. so the PSN needs to work more to cover the function of the digestive system.
* good foods for the intestine --- fig, ginger, carrot, daikon, turnip, yam...
A lateral approach is it could be a same effect if the blood capillary is strong, mucosa of the nasal cavity might be strong, because the blood capillary is beneath of that.
* taking vitamin P (it contents in thin skin and pith = white strings of orange) to strengthen the blood capillary. Vitamin P is not water solubility, but it dissolve well in alkaline. Some of high alkalinity foods are string beans, mushroom, yam, spinach, carrot, soybeans, seaweed and banana.
Blending vitamin P + alkaline = can be expected high absorption, an easy way is making fresh juice, orange + carrot (a yang food = warms the body up in macrobiotic theory), orange + banana (a yin food = cool the body down). We might use them according to the season and body condition.