Evidence supporting the use of: Vitamin C
For the health condition: Colds (antiviral)
Synopsis
Source of validity: Scientific
Rating (out of 5): 2
Vitamin C (ascorbic acid) has a long history of use for the prevention and treatment of the common cold. It became popular after Nobel laureate Linus Pauling advocated for its use in the 1970s. Since then, numerous clinical trials and meta-analyses have investigated its efficacy. Scientific evidence suggests that routine vitamin C supplementation (≥200 mg/day) does not reduce the incidence of colds in the general population. However, consistent findings indicate that it can modestly reduce the duration and severity of cold symptoms. For example, a 2013 Cochrane review of 29 trials involving over 11,000 participants found that regular vitamin C supplementation shortened the duration of colds by about 8% in adults and 14% in children. The same review concluded that vitamin C supplementation did not significantly reduce the risk of getting a cold, except in people under extreme physical stress (such as marathon runners or soldiers in subarctic conditions), where incidence was halved. The proposed antiviral mechanism is largely indirect: vitamin C is thought to support immune function by acting as an antioxidant, maintaining epithelial integrity, and supporting various cellular functions of both the innate and adaptive immune system. While vitamin C is not a true antiviral, its role in immune support provides a plausible rationale for its modest benefit in cold management. Overall, while there is some scientific validation, the benefits are limited and not dramatic.
Other ingredients used for Colds (antiviral)
AcacetinAgastache
AHCC
Allicin
Alliin
Allium tuberosum
Allspice
Allyl isothiocyanate
Allyl sulfide
Aloe vera
alpha-terpineol
alpinia galangal
amentoflavone
anamu
Andrographis
andrographolide
anthocyanins
apigenin
arabinogalactan
Asam gelugor
ash
Asteraceae
atractylone
Aureobasidium pullulans
Autumn elaeagnus
baicalin
Baikal Skullcap
balsam
Baphicacanthus cusia
Basidiomycota
basil
Bassia scoparia
bee hive
bee products
bee propolis
berry
beta-pinene
Bidens pilosa
bilberry
bishop\'s weed
bitter grass
black cumin
black currant
black galingale
black garlic
black nightshade
black seed
blueberry
Bombax
borneol
Broussonetia
buckthorn
caffeic Acid
Camellia sinensis
capillary artemisia
carrageenan
carvacrol
cat's claw
catechins
Celosia
Chinese mountain ant
Chinese raisintree
Chondrus
chrysanthemum
cinnamaldehyde
cinnamon
Cistus
citron
Citrus
citrus bioflavonoids
Clerodendrum trichotomum
clove
coconut
commiphora
common madia
coriolus mushroom
costus
cowherb
curry leaf
David\'s milkberry
deoxyandrographolides
Echinacea
echinacea purpurea
Elder
elderberry
epigallocatechin gallate (EGCG)
essential oil blend
European Elder
flavones
flavonoids
flavonones
forsythia
fruit
fulvic acid
fungus
Galangal
Gallesia
gallotannin
gamma-terpinene
ganoderma
garlic
garlic bulb
ginger
glyceryl monolaurate
Glycyrrhetinic acid
Glycyrrhizin
goji berry
goldthread
green tea
Hedyotis
Himalaya berry
honey
honey loquat syrup
honeysuckle
Houttuynia
hyssop
Indian frankincense
Indian kinotree
indigo leaves
Isatis
knotweed
labrador tea
Lactoferrin
Lactoperoxidase
Laggera pterodonta
lauric acid
lemon
lemongrass
lichen
licorice root
Ligusticum
ligustilides
Ligustrum
Litsea
liverwort
Lomatium
luffa
luteolin
mangostin
Mastic gum
Melia
Mineral ascorbate
Monolaurin
Monoterpenes
Morinda
Morus
Mugwort
Mushroom
Naphthoquinones
Neem tree
Neoandrographolides
nut grass
Nymphaea nouchali
oregano
oriental arborvitae
Osha
Osmanthus
Oxystelma
papaya
Paris polyphylla
Patrinia
pau d'arco
perilla
Petiveria
Phaeophyceae
Phellodendron
phellodendron amurense
phenolic compounds
Phenylpropanoids
Phyllanthus
pineapple
Piper nigrum
Polygonum
pomegranate
Propolis
quercetin
ravinsara
resveratrol
rhizome
rosemary
Salvia
Sambucus nigra
Sandalwood
saponins
schizonepeta
Sesquiterpenes
shiitake mushroom
Shikimic Acid
Shogaol
Smartweed
Solanaceae
Solanum indicum
Sophora
soursop
spirulina
Tagetes
Tamaricaceae
Tayuya
Tea
Terpenoids
Theaflavin
Thiosulfinate
thyme
Thymus
Trametes
Triterpenes
turmeric
Verbascoside
Viola
Violet
Visnea Mocanera
vitamin C
vitamin D
Wasabi
Waterhyssop
White Tea
xanthium (cockleburs)
Xanthorrhizol
zanthoxylum
Zinc
Zingiberene
Other health conditions supported by vitamin C
Acquired Immune Deficiency SyndromeAddictions (general remedies for)
Addison's Disease
Age Spots
Aging (prevention)
Alcoholism
Allergies (food)
Allergies (respiratory)
Anal Fistula or Fissure
Anemia
Antibiotics (alternatives to)
Antibiotics (side effects of)
Arteriosclerosis
Asthma
Athletic and Exercise Aids
Autism
Autoimmune Disorders
Bites and Stings
Bladder Infection
Bleeding (external)
Bleeding (internal)
Blood Poisoning
Boils
Bronchitis
Bruises (healing)
Bruises (prevention)
Burns and Scalds
Capillary Weakness
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
Adrenal Fatigue
Abrasions
Acne
Abscesses
Bell's Palsy
Cancer Treatment (reducing side effects)
Carbuncles
Alzheimer's Disease
Anxiety
Arthritis
Cancer (natural therapy for)
Cancer (prevention)
Canker Sores
Cardiovascular Disease
Products containing vitamin C
Nature's Sunshine Love and Peas (Sugar Free Original Formula)
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
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 (Sugar Free) NEW!
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 Pouch
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
