Bromelain
Bromelain, a
protein-digesting enzyme complex
derived from pineapple, has been
shown to have an antitussive
effect (cough suppression), and to
provide a reduction in the thickness of mucus.
(2) Bromelain's mucolytic activity
reduces bronchial secretions,
making it effective in treating
respiratory tract diseases (3).
Vitamin C
Vitamin C serum
levels are often low in patients
with chronic bronchitis and other
severe respiratory illnesses (4).
Supplementation with vitamin C can
produce clinical improvement in
patients with chronic bronchitis
and respiratory infection (5).
Herbal
expectorants
Herbal expectorants
decrease the thickness of mucus
and promote the expulsion of mucus
secretions. Effective herbal
expectorants include; lobelia
(Lobelia inflata), licorice (Glycyrrhiza
glabra), gumweed (Grindelia
comporum), wild cherry bark (Prunus
sp.), horehound (Marrubium
vulgare),
coltsfoot (Tussilago farfara),
sundew (Drosera rotundifolia), and
glycerol guaiacolate.
Glycerol guaiacolate is also known
as guaifenesin, and is
found in a large variety of
over-the-counter cough formulas (6).
N-Acetyl-Cysteine
(NAC)
Studies show that
N-Acetyl-Cysteine (NAC)
supplementation may relieve
certain symptoms associated with
chronic bronchitis. NAC has
also been found to lower the frequency
and duration of acute
exacerbations (AECBs).
N-Acetyl-Cysteine may also be used
as a preventive agent against the
onset of this condition, as its
usage has been shown to decrease the rate of
hospitalizations for chronic
bronchitis sufferers in
clinical study (7,
8).
Tylophora
asthmatica
The botanical,
Tylophora asthmatica, has been
traditionally used in Ayurvedic
medicine for millennia in the
treatment of bronchial
asthma and other lung disorders. Studies
have shown that supplementation
with tylophora leaves and extract
are effective in relieving
bronchial asthma symptoms.
The bronchodilator effects
credited to tylophora are,
however, short-acting (9,
10).
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