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There are a number of natural antihistamines that may help relieve allergy symptoms.

Vitamin C boosts the immune system. It also acts as a natural antihistamine.

According to a on vitamin C in the treatment of allergies, oxidative stress plays a key role in allergic diseases. As vitamin C is a powerful antioxidant and anti-inflammatory, it may act as a treatment for allergies.

The researchers observed that high doses of intravenous vitamin C reduced allergy symptoms. They also reported that a deficiency in vitamin C might lead to allergy-related diseases.

Another suggests taking 2 grams (g) of vitamin C daily to act as an antihistamine.

The vitamin is present in many fruits and vegetables, including:

  • bell peppers
  • broccoli
  • cantaloupe melon
  • cauliflower
  • citrus fruits
  • kiwifruit
  • strawberries
  • tomatoes and tomato juice
  • winter squash

Vitamin C supplements, with and without bioflavonoids, are available in health stores, drug stores, and .

Butterbur is a plant extract from a shrub that grows in Asia, Europe, and some parts of North America. People often use butterbur to treat migraines and hay fever, also known as allergic rhinitis.

According to the National Center for Complementary and Integrative Health (NCCIH), butterbur antihistamine effects.

A of 16 randomized controlled trials, testing 10 herbal products, suggests that butterbur could be an effective herbal treatment for hay fever.

This review suggested that butterbur was better than a placebo, or as effective as antihistamine medications, for relieving allergy symptoms.

However, the authors of the review point out that some large studies received funding from industry manufacturers, and so further independent research is needed.

Most people tolerate butterbur well, according to the , but it may cause side effects such as:

Raw butterbur extracts certain compounds called alkaloids that can cause liver damage and cancer. Extracts of butterbur that do not contain these substances are available. However, no studies have looked into the long-term effects of using these products.

The plant extract can also cause allergic reactions in people with sensitivities to ragweed, chrysanthemums, marigolds, and daisies.

Pineapple juice contains the anti-inflammatory enzyme bromelain.

Bromelain is an enzyme found in the core and juice of pineapples and is also available as a supplement.

Bromelain is a popular natural remedy for swelling or inflammation, especially of the sinuses and following injury or surgery.

on mice suggests that bromelain can reduce allergic sensitization and allergic airway disease thanks to its anti-inflammatory and anti-allergic properties.

In some people, oral supplementation of bromelain may cause such as:

  • changes in menstruation
  • digestive upset
  • an increased heart rate

People who are allergic to pineapple should avoid bromelain.

Bromelain supplements are available at health stores and .

Quercetin is an antioxidant flavonoid found in many plants and foods. Research suggests that adding quercetin to the diet may help to relieve allergy symptoms.

reports that quercetin can have anti-allergic and antihistamine properties.

In one , researchers found that quercetin could reduce the respiratory effects of allergies in mice by lowering airway inflammation.

However, the evidence for its effectiveness is mixed, and according to , there is not enough evidence to suggest that quercetin can relieve allergic rhinitis.

Quercetin is naturally present in many foods and herbs, including:

However, taking supplements of quercetin will work better in the treatment of allergies than eating foods that contain it. This is because foods contain significantly lower levels of the flavonoid.

Quercetin is generally safe for most people. It headaches and tingling in the arms and legs of some people. Very high doses, especially when taken long-term, may cause kidney damage.

People can buy quercetin supplements at health stores or .

Other natural remedies

state that there is not enough evidence to suggest that the following natural products can help with the symptoms of allergic rhinitis:

  • astragalus
  • grape seed extract
  • omega-3 fatty acids
  • stinging nettle
  • Pycnogenol
  • spirulina

If natural antihistamines do not reduce a person's allergy symptoms, they may need to seek alternatives.

Other methods to treat and prevent allergy symptoms include:

Avoiding the allergen

Allergy avoidance is typically the first line of defense against symptoms. Try to identify the allergen, which might be pollen, pet dander, or mold spores, and reduce exposure to it as much as possible.

Medications

Allergy shots may be helpful for people with severe allergies.

Allergy medicines can cause the immune system's reaction to the allergen to calm down. Antihistamines work by breaking down histamine in the body.

Antihistamine medications can reduce symptoms such as sneezing, itchy eyes, and sinus pressure.

Medications for allergies are available OTC or by prescription and include:

Immunotherapy

People with severe allergies may benefit from immunotherapy. This treatment is also suitable if allergy medications do not relieve symptoms.

During immunotherapy, a healthcare professional will give a person a series of injections that contain tiny amounts of the allergen. This treatment may take place over several years and aims to desensitize the body to the allergen.

For people with pollen allergies, doctors may recommend sublingual immunotherapy. This involves placing a tablet under the tongue until it dissolves.

Epinephrine treatment

Those with severe allergies may need to carry an emergency epinephrine shot (Auvi-Q, EpiPen) with them at all times. Giving this treatment at the onset of an allergic reaction can reduce symptoms and may save a person's life.