I've posted about this before. You won't have allergies, if your adrenals are working well. Many reasons that they are not. Number one is stress. The adrenal cortex is important to immunity. They are the master gland. Even the thyroid won't function well without assistance from the adrenals. The adrenals, among other things, produce epinephrine to help with the symptoms of an allergen. Some allergens can tax the adrenals sufficiently to cause adrenal fatigue.
When the body is unwell, it will give priority of vitamin C to the adrenals at the expense of all other body parts. This is why you should take more vitamin C during this time. The second most important substance is vitamin B5, pantothenic acid. A single B vitamin is not a good idea. Instead, supplement with a B complex of no more than 50. Anything greater is a waste and will be washed out.
Adaptogenic herbs are very important for the adrenals too. Adaptogenic herbs are ginseng, ashwaganda, astragalus, licorice root, schisandra (my favorite), jiagulan (my second favorite). Some mushrooms have excellent adaptogenic properties, reishi, shitake, and maitake.
So consider taking all 3 supplements - Vit C, Vit B, adaptogen.
Life is just one damned thing after another - Elbert Hubbard
I'm not sure where you live, but I live in Florida where out of the top 5 cities that people suffer from allergies 3 of them are here in central florida. It's very difficult for me to find a peson who does not suffer from season allergies, mostly pollen. So people who do not live in this area really have no clue or understand how majority of people suffer from allergies here.
It's harder for me to find a person who does not suffer from allergies during pollen season than a person who does not suffer from allergies.
The issue is really how bad is your allergies compared to other people. Some people can't breath, because their nose is stuff, while others will sneeze a lot...etc
After trying everything, Vitamin C is really the only thing that really helps. I take at least 1,000mg in the morning and 2,000 mg at night. The other thing that works well, but is expensive is quercetin and bromelain, especially if you are taking good quality and daily.
Many people here do nasal irrigation on a daily bases. One coworker who suffers from allergies does it every morning and every night. Personally I only do it the nassal irrigation when I feel my nose is stuffy or if I've gone outside and mowed my yard or something of that nature.
Pollen is extremely high right now, this time of year