Evidence supporting the use of: Licorice root
For the health condition: Cough (general)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Licorice root (Glycyrrhiza glabra) has a long history of use as a remedy for coughs and other respiratory ailments in traditional medicine systems such as Traditional Chinese Medicine (TCM) and Ayurveda. Its sweet, soothing properties are thought to help relieve throat irritation and suppress coughing. Historically, licorice root was included in cough syrups and lozenges for these reasons.

Scientifically, licorice root contains several active compounds, such as glycyrrhizin and liquiritin, which exhibit anti-inflammatory, demulcent, and expectorant properties. Laboratory studies and a limited number of clinical trials suggest that licorice root extracts can reduce inflammation in the airways, thin mucus, and soothe sore throats. For example, a few small human studies have shown that licorice gargles can reduce postoperative sore throat and cough symptoms. Additionally, in vitro studies indicate that licorice compounds may inhibit certain respiratory viruses and bacteria.

However, the clinical evidence supporting licorice root’s effectiveness for cough is limited and not robust. Most studies are small, short-term, or not well-controlled. Systematic reviews conclude that while there is some promise, more rigorous, large-scale human trials are needed to determine efficacy and safety for cough treatment. Importantly, excessive or prolonged use of licorice root can cause side effects such as hypertension and hypokalemia due to glycyrrhizin content.

In summary, licorice root’s use for cough is supported by both traditional use and a modest amount of scientific evidence, but the evidence is currently not strong enough for definitive clinical recommendations.

More about licorice root
More about Cough (general)

Other ingredients used for Cough (general)

allspice
aloe vera
alpha-pinene
apple
waterhyssop
bamboo
basil
benegut perilla (proprietary)
beta-pinene
black cumin
black currant
black pepper
radish
Indian frankincense
carrot
cassia bark
cat's claw
chen pi
Chinese salvia root
cinnamon
clove
cowage seed
turmeric
elderberry
fennel
garlic bulb
ginger
glehnia root
grape
greek mountain tea
onion
green tea
heartwood
Indian tinospora
jujube
lemon
licorice root
lovage
marshmallow
nettle
ophiopogon root
orange
oregano
parsley
pear
perilla
phellodendron amurense
platycodon root
plum fruit
polygala root
pomegranate
pumpkin
raspberry
spearmint leaf
sphaeranthus indicus
thyme
vitamin C
zhejiang fritillary
zinc
sarsaparilla
boneset
mullein
tangerine
hyssop
atractylodes
lobelia
capsicum
Indian bael
neem tree
malabar nut
alpinia galangal
ferula assafoetida
hedychium spicatum
inula racemosa
anise
pistacia integerrima gall
punarnava
fumaria parviflora
prickly ash
fritillaria
lemongrass
yerba santa
elecampane
coltsfoot
root tuber
silk tree
juniper berries
amber
dodder
sweet flag
hyacinth bean
eucalyptus
menthol oil
peach
abies spectabilis
horehound
soursop
Alcohol
Aralia
Apple Cider Vinegar
Agastache
Anamarrhena
Alpha-terpineol
Ambergris
Ardisia
Angelica
acacia
Agave
Allicin
Anamu
Abrus
Alchornea
Asarum heterotropoides
Albizia
Aconite
Asafoetida
Ajuga
Andrographolide
Aerva lanata
Agarwood
Asam gelugor
Arrowroot
Andrographis
Alsonia scholaris
Allyl Sulfide
Aspen
Adenophora
Allium tuberosum
Amor seco
Aniseed myrtle
Asarum sieboldii
Alantolactone
Atractylone
Black Seed
Bermuda Grass
Bryonia
Blepharis
Bayleaf
Blackbrush
Big Quaking Grass
Bougainvillea
Bael
Butternut
berry
Baccharoides anthelmintica
black salt
Bee products
Borassus Palm
Buddha's Hand
Borassus aethiopum
Borage
banana
Bassia scoparia
Burning Bush
Balloon Flower
Belamcanda
Bergenia
Boerhavia diffusa
Coconut
Cactus
Citron
Citrus
Cineole
Capsaicin
Chenopodium
Cistus
Common madia
Cubeb
Cowslip
Chaenomeles lagenaria
Calamus
Coin-leaf desmodium
Cyanthillium cinereum
Cinnamaldehyde
Costus
Chekiang Fritillary
cola nut
Celosia
Clerodendrum indicum
Culvers Root
Currant
Chondrus
Dragonhead
Diterpenes
Desmodium
Dichrostachys glomerata
Empresstree
English Horsemint
Echinacea
Elder
European Field Elm
Ephedrine
Embelia
Fig
Garlic
Galangal
Himalayan Salt
Ivy
Lily
Poppy
Rose
Spikenard
Sumac
Zucchini

Other health conditions supported by licorice root

Abdominal Pain
Abrasions
Abscesses
Acid Indigestion
Acne
Addictions (general remedies for)
Addictions (tobacco smoking or chewing)
Addison's Disease
Adenitis
Adrenal Fatigue
Afterbirth Pain
Age Spots
Allergies (respiratory)
Amenorrhea
Anal Fistula or Fissure
Anemia
Appetite (deficient)
Asthma
Autoimmune Disorders
Bronchitis
Canker Sores
Chemotherapy (reducing side effects)
Chicken Pox
Cholera
Chronic Obstructive Pulmonary Disorder
Cirrhosis of the Liver
Cold Sores
Colds (antiviral)
Colds (decongestant)
Colds (general)
Colds (prevention)
Colds (with fever)
Colic (adults)
Colic (children)
Colitis
Colon (atonic)
Colon (spastic)
Congestion
Congestion (bronchial)
Congestion (lungs)
Congestion (lymphatic)
Congestion (sinus)
Constipation (adults)
Contagious Diseases
Convalescence
Cough (damp)
Cough (dry)
Cough (general)
Cough (spastic)
Cramps (menstrual)
Crohn's Disease
Croup
Cushing's Disease
Cytomealovirus
Dyspepsia
Eczema
Emphysema
Endometriosis
Enteritis
Epstein Barr Virus
Estrogen (low)
Fatty Liver Disease
Fever
Fibrosis
Gall Bladder (sluggish or removed)
Gall Stones
Gas and Bloating
Gastritis
Gingivitis
Glands (swollen lymph)
Goiter
Gonorrhea
Gout
Grave's Disease
Hair (loss or thinning)
Hair Care (general)
Halitosis
Hangover
Headache (general)
Headache (sinus)
Headache (tension)
Heart (weakness)
Hemorrhoids
Hepatitis
Hernias
Herpes
Hiatal Hernia
Hiccups
Hot Flashes
Hypotension
Hypothyroid
Impetigo
Indigestion
Infection
Infection (bacterial)
Infection (viral)
Inflammation
Inflammatory Bowel Disorders
Influenza
Injuries
Itching
Itching Ears
Jaundice (adults)
Jock Itch
Kidney Infection
Laryngitis
Leaky Gut Syndrome
Leprosy
Lesions
Leucorrhea
Liver Detoxification
Lungs (fluid in)
Lyme Disease
Lymph Nodes or Glands (swollen)
Malaria
Mastitis
Measles
Menopause
Menorrhagia
Menstrual Irregularity
Menstruation (scant)
Mental Illness
Metabolic Syndrome
Mononucleosis
Mood Swings
Morning Sickness
Mumps
Nausea and Vomiting
Nephritis
Nervous Exhaustion
Nervousness
Night Sweating
Nocturnal Emission
Oral Surgery
Ovarian Pain
Overacidity
Pertussis
Pleurisy
PMS (general)
Pneumonia
Poison Ivy or Oak
Rashes and Hives
Rosacea
Sore Throat
Ulcers