- Vitamin C Research has shown that vitamin C can reduce blood levels of histamine. Studies have shown that 1,000 milligrams of vitamin C drastically reduced the blood histamine level of a group of volunteers. Some doctors picking up from this study suggests vitamin C as part of allergy treatment.
- Vitamin B Alan Gaby, M.D. said "I often get good results by treating hay fever with supplements of pantothenic acid," (from the book Blended Medicine, Michael Castleman) He recommends to take 100 to 1,000 milligrams of vitamin B every day.
Bromelain Bromalain supplements is may help suppress cough, reduce nasal mucus associated with sinusitis, and relieve the swelling and inflammation caused by hay fever and is generally used for allergy treatment. This supplement is often administered with quercetin.
Quercetin it is another supplement used for allergy treatment together with bromalain. Quercetin is a flavonoid, a plant pigment responsible for the colors found in fruits and vegetables. Quercetin acts as allergy treatment by inhibiting the production and release of histamine.