Evidence supporting the use of: Vitamin C
For the health condition: Asthma
Synopsis
Source of validity: Scientific
Rating (out of 5): 2
Vitamin C (ascorbic acid) has been investigated as a supportive treatment for asthma due to its antioxidant and anti-inflammatory properties. The rationale is that oxidative stress and inflammation play roles in asthma pathogenesis, and vitamin C may help mitigate these processes. Historically, vitamin C has not been widely used in traditional medicine specifically for asthma, but interest in its potential benefits grew with modern research into antioxidants and respiratory health.
Several small clinical trials and observational studies have explored the effects of vitamin C supplementation in people with asthma. Some studies have reported modest improvements in lung function (such as FEV1), reduced bronchial hypersensitivity, and fewer asthma exacerbations, particularly in cases where symptoms are triggered by exercise or respiratory infections. However, results have been inconsistent, and many trials have methodological limitations, including small sample sizes and short durations.
Systematic reviews and meta-analyses generally conclude that while vitamin C may have minor beneficial effects—especially in subgroups like those with exercise-induced asthma—the overall evidence is not strong enough to recommend routine vitamin C supplementation for asthma management. Leading asthma guidelines do not include vitamin C as a standard treatment. More robust, large-scale studies are needed to clarify its role. In summary, scientific interest exists, but evidence remains limited and inconclusive.
Other ingredients used for Asthma
adrenal cortexalpha-pinene
apple
ashwagandha
waterhyssop
bamboo
barberry
basil
beet
myrobalan
benegut perilla (proprietary)
beta caryophyllene
betel
bifidobacterium longum
black cumin
black currant
black garlic
black pepper
radish
Indian frankincense
bасора
caffeine
cannabis sativa oil
carrot
caterpillar mushroom
Chinese salvia root
citrus oil
clove
cordyceps
cowage seed
turmeric
curcumin
DHA (docosahexaeonic acid)
EPA (eicosapentaenoic acid)
epigallocatechin gallate (EGCG)
fennel
fish oil
flavonols
forskohlii root
garlic bulb
ginger
ginkgo biloba
ginseng
glehnia root
gooseberry
greek mountain tea
green lipped mussel
onion
green tea
heartwood
horseradish
Indian gum arabic tree
Indian tinospora
jujube
kudzu
licorice root
luteolin
magnesium
marine lipid
marshmallow
mastic gum
moringa
mustard seed
n-acetyl-cysteine (NAC)
omega-3 fatty acids
ophiopogon root
orange
oregano
pear
perilla
phellodendron amurense
phytocannabinoids
pine bark
plantain
platycodon root
plum fruit
polygala root
pumpkin
quail egg
quercetin
raspberry
reishi mushroom
rhizome
rosemary
schizonepeta
scrophularia root
shiitake mushroom
slippery elm bark
specialized pro-resolving mediators (SPMs)
sphaeranthus indicus
spirulina
thyme
triphala
almond fruit
vitamin C
vitamin D
vitamin D3
vitamin E
seaweed
watercress
wheat grass
mulberry
zhejiang fritillary
squawvine
mullein
parthenium
tangerine
typhonium
xanthium (cockleburs)
gastrodia
hyssop
cardamom
atractylodes
lobelia
papaya
shen-chu
capsicum
mugwort
Indian bael
neem tree
nut grass
malabar nut
alpinia galangal
clerodendrum indicum
ferula assafoetida
hedychium spicatum
inula racemosa
anise
pistacia integerrima gall
tylophora
punarnava
commiphora
tinospora cordifolia
blackboard tree
caesalpinia crista
swertia
bee pollen
chaff flower
peony
lingzhi
lingusticum wallichii
buckthorn
fritillaria
morus
lemongrass
myrrh
yerba santa
elecampane
coltsfoot
root tuber
chrysanthemum
siler root
amber
dioscorea
dodder
fern
ganoderma
sweet flag
hyacinth bean
sweetgums
morinda
oriental arborvitae
trichosanthes
zanthoxylum
royal jelly
polyphenols
purslane
fulvic acid
menthol oil
aster root
peach
biota seed
goji berry
paw paw
horehound
herbal blend (proprietary)
indigo leaves
cocoa
cayenne pepper
soursop
1,3,7-Trimethylpurine-2,6-dione
Aralia
Agastache
Anamarrhena
Angel's Trumpet
Ambergris
Ardisia
Angelica
acacia
Apigenin
Auricularia
Anamu
Abrus
Asarum heterotropoides
Albizia
Aconite
Asafoetida
Ajuga
Andrographolide
Adrenergic amines
Aerva lanata
Agarwood
American Liverleaf
Astragaloside
Adrenaline
Andrographis
Alsonia scholaris
Asteracea
Allium tuberosum
Amor seco
Arani
Arisaema
Asarum sieboldii
Apocynin
Astragalin
Atractylone
Bee Propolis
Black Seed
Bermuda Grass
Baikal Skullcap
Baphicacanthus cusia
Bidens pilosa
Broussonetia
bergenin
Blepharis
Balsam
Bishop's Weed
Boswellic Acid
Bayleaf
Butea monosperma
Black galingale
Barleria
Bougainvillea
Baicalein
Bee hive
Bael
Basidiomycota
Boswellia
Baccharoides anthelmintica
Banyan
Butterbur
Bee products
Black Nightshade
Bombax
Borassus Palm
Borassus aethiopum
Bacteria
Borage
Black root
banana
Bupleurum
bacoside
Baicalin
Bassia scoparia
Black Hellebore
Balloon Flower
Belamcanda
Bergenia
Boerhavia diffusa
Borneol
Bird's nest
Cumin
Chinese Silkvine
Curry leaf
Caryophyllene
California chia
Cinnamomum
Chinese Mountain Ant
Clerodendrum trichotomum
Cod Liver Oil
Cortisol
Codonopsis
Cnidium
Clerodendrum phlomidis
Cactus
Capillary Artemisia
Citron
Curcuminoid
Carry Me Seed
Citrus
Cineole
Catecholamine
Chinese Raisintree
Chlorophytum
Cowherb
Curcumen
Coca
Cinnamic Acid
Chocolate
Chinese Ligustrum berry
Cinidium
Centipeda
Cubeb
Curcuma
cypress
Chaenomeles lagenaria
Clostridium butyricum
Coin-leaf desmodium
Chinatree
Cyanthillium cinereum
Costus
Chekiang Fritillary
cola nut
Celosia
Clerodendrum indicum
DIVI-DIVI
Dragonhead
Desmodium
Dichrostachys glomerata
Ephedra
European Elder
Erythropalum scandens
Erodium cicutarium
Eclipta
Echinodorus
Eicosapentaenoic Acid
Essential Oil Blend
Elephant's Head
Euphorbia
Ephedrine
Embelia
Fig
Goldthread
Garlic
Galangal
Himalayan Salt
Ivy
Lotus
Little ironweed
Mustard
Mallow
Orchid
Spikenard
Sandalwood
Sumac
Theophylline
Vervain
Zucchini
Other health conditions supported by vitamin C
AbrasionsAbscesses
Acne
Acquired Immune Deficiency Syndrome
Addictions (general remedies for)
Addison's Disease
Adrenal Fatigue
Age Spots
Aging (prevention)
Alcoholism
Allergies (food)
Allergies (respiratory)
Alzheimer's Disease
Anal Fistula or Fissure
Anemia
Antibiotics (alternatives to)
Antibiotics (side effects of)
Anxiety
Arteriosclerosis
Arthritis
Asthma
Athletic and Exercise Aids
Autism
Autoimmune Disorders
Bell's Palsy
Bites and Stings
Bladder Infection
Bleeding (external)
Bleeding (internal)
Blood Poisoning
Boils
Bronchitis
Bruises (healing)
Bruises (prevention)
Burns and Scalds
Cancer (natural therapy for)
Cancer (prevention)
Cancer Treatment (reducing side effects)
Canker Sores
Capillary Weakness
Carbuncles
Cardiovascular Disease
Cartilage Damage
Cataracts
Cervical Dysplasia
Chemical Poisoning
Chemotherapy (reducing side effects)
Chicken Pox
Cholesterol (high)
Chronic Obstructive Pulmonary Disorder
Cold Sores
Colds (antiviral)
Colds (decongestant)
Colds (general)
Colds (prevention)
Colds (with fever)
Colon (atonic)
Congestion
Congestion (bronchial)
Congestion (lungs)
Congestion (sinus)
Conjunctivitis
Contagious Diseases
Convalescence
Copper Toxicity
Cough (dry)
Cough (general)
Cuts
Cystic Breast Disease
Cystic Fibrosis
Debility
Dementia
Denture Sores
Depression
Diabetes
Diabetic Retinopathy
Environmental Pollution
Epstein Barr Virus
Eye Problems
Eyesight (poor)
Fatigue
Fatty Liver Disease
Free Radical Damage
Gall Stones
Gastritis
Gingivitis
Glaucoma
Gonorrhea
Gout
Hair (loss or thinning)
Hair Care (general)
Heart (weakness)
Heavy Metal Poisoning
Hemorrhoids
Hepatitis
Herpes
Hot Flashes
Hypertension
Infection
Infection (bacterial)
Infection (viral)
Infertility
Inflammation
Inflammatory Bowel Disorders
Influenza
Injuries
Knees (weak)
Laryngitis
Lead Poisoning
Lesions
Leucorrhea
Leukemia
Ligaments (torn or injured)
Liver Detoxification
Lyme Disease
Macular Degeneration
Mastitis
Measles
Memory and Brain Function
Menorrhagia
Menstrual Irregularity
Menstruation (scant)
Metabolic Syndrome
Mononucleosis
Mumps
Nose Bleeds
Oral Surgery
Osteoporosis
Pancreatitis
PMS (general)
PMS Type C
PMS Type H
Pneumonia
Post Partum Weakness
Pregnancy (herbs and supplements for)
Progesterone (low)
Prolapsed Uterus
Prostatitis
Radiation Sickness
Rashes and Hives
Restless Leg Syndrome
Rheumatoid Arthritis
Rhinitis
Rhinitis, Allergic
Rosacea
Scars / Scar Tissue
Schizophrenia
Scratches and Abrasions
Scurvy
Shingles
Shock
Sinus Infection
Skin (infections)
Skin Care (general)
Sore Throat
Spider Veins
Spinal Disks
Sprains
Strep Throat
Stretch Marks
Sunburn
Surgery (healing from)
Surgery (preparation for)
Teeth (loose)
Tendonitis
Thrush
Tickle in Throat
Tonsillitis
Tooth Extraction
Toxemia
Triglycerides (high)
Tuberculosis
Ulcerations (external)
Ulcers
Uric Acid Retention
Urinary Tract Infections
Vaginitis
Varicose Veins
Warts
Wounds and Sores
Wrinkles
Products containing vitamin C
Nature's Sunshine Love and Peas (Sugar Free)
Nature's Sunshine Adrenal Support
Nature's Sunshine Bowel Detox
Nature's Sunshine Children's Elderberry Immune
Nature's Sunshine Children's MultiVitamin & Mineral
Nature's Sunshine Cortisol Formula (Nature's Cortisol Formula)
Nature's Sunshine Defense Maintenance
Nature's Sunshine Detox Basics (Best used by 7/31/25)
Nature's Sunshine Dieter's Cleanse
Nature's Sunshine Glandular System
Nature's Sunshine Grapine With Protectors (SynerPro)
Nature's Sunshine Hepatic System
Nature's Sunshine Iron (Chelated)
Nature's Sunshine Love and Peas
Nature's Sunshine Marine Collagen
Nature's Sunshine Marine Glo Collagen
Nature's Sunshine Master Gland Formula®
Nature's Sunshine Mega-Chel
Nature's Sunshine Milk Thistle Combination
Nature's Sunshine MultiVitamin & Mineral (SynerPro)
Nature's Sunshine MultiVitamin & Mineral (Time Release)
Nature's Sunshine Natural Changes
Nature's Sunshine Nature's Prenatal
Nature's Sunshine Nature's Harvest
Nature's Sunshine Nervous System (30 Day Program)
Nature's Sunshine Nutri-Calm
Nature's Sunshine Nutri-Calm
Nature's Sunshine Perfect Eyes
Nature's Sunshine Power Beets Pouch
Nature's Sunshine Power Beets To-Go Packs
Nature's Sunshine Power Greens
Nature's Sunshine Power Greens To-Go
Nature's Sunshine Skeletal Strength
Nature's Sunshine Solstic Twenty-Four
Nature's Sunshine Solstic Immune
Nature's Sunshine Solstic Revive
Nature's Sunshine Structural System (30 Day Program)
Nature's Sunshine Super Supplemental
Nature's Sunshine Super Supplemental (Without Iron)
Nature's Sunshine Super Trio
Nature's Sunshine Vari-Gone
Nature's Sunshine Vitamin C (1000 mg, Time Release)
Nature's Sunshine Vitamin C (1000 mg, Time Release)
Nature's Sunshine Vitamin C Ascorbates
Nature's Sunshine Chewable Vitamin C
Nature's Sunshine Citrus Bioflavonoids (Vitamin C)
Nature's Sunshine Zinc Lozenge
