Which natural ingredients can have an effect on asthma?

from http://www.healthresearchdata.com/health-concerns/treatments/asthma.html

Carotenoids, grape seed extract, quercetin, N-acetylcysteine, ginkgo biloba, coenzyme Q10, fish oils (EPA/DHA), vitamins B5, B6, B12 and C, selenium, magnesium and molybdenum.

from

http://www.practicalasthma.net/pages/practical_strategy.htm

In the presence of ample nutritive factors such as vitamins B3 and B6 as well as zinc and magnesium and such fatty acids as EPA, DHA, and GLA, antinflammatory mediators are more likely to be produced.