There are many treatments available for allergies beyond pharmaceutical meds including herbs, supplements, homeopathic medicines, and more. Here are a few that either I and people I know have found helpful or that I have found plausible evidence to support.
HERBS
Quercetin
Nettle (stinging nettle)
Turmeric
Fruit enzymes including papain and bromelain
Combo products including:
Nettle/Quercetin capsules
Aller-Aid™ with Quercetin Capsules from Oregon's Wild Harvest
TurmeriPro™ Capsules (allergy is an inflammatory response)
Spring Care Extract from Mountain Rose
Favorite sources of herbs:
Oregon's Wild Harvest
Mountain Rose Herbs
Frontier
Antiallergic Potential on RBL-2H3 Cells of Some Phenolic Constituents of Zingiber officinale (Ginger)
"In the present study on five pure phenolic compounds (1−5) isolated from the rhizomes of Zingiber officinale (ginger) and investigated for their antiallergic potency, rat basophilic leukemia (RBL-2H3) cells were incubated with these compounds and the release of β-hexosaminidase was measured kinetically. The data obtained suggest that ginger rhizomes harbor potent compounds capable of inhibiting allergic reactions and may be useful for the treatment and prevention of allergic diseases."
Positive results with faecal microbiota therapy for patients with peanut allergies
Microbiota Therapy Acts Via a Regulatory T Cell MyD88/RORγt Pathway to Suppress Food Allergy
Inhibition of Prekallikrein for Hereditary Angioedema
PALFORZIA is a new medical treatment for children between the ages of 4 and 17 who have a severe allergy to peanuts. It may help reduce the severity of allergic reactions, including anaphylaxis, that may occur with accidental exposure to peanut, but it also may cause anaphylaxis as a side effect. It works by masking the peanut allergy be exposing a child to small, precise amounts of peanut protein every day, but this exposure may also trigger a reaction.
