Evidence supporting the use of: Vitamin C
For the health condition: Infection (viral)
Synopsis
Source of validity: Scientific
Rating (out of 5): 2
Vitamin C (ascorbic acid) has long been associated with immune support and the management of viral infections. The justification for its use in viral infections is grounded in both scientific investigation and traditional practice; however, the overall quality and consistency of evidence are moderate at best. Vitamin C is an essential nutrient with known antioxidant properties, and it plays a role in various cellular functions of both the innate and adaptive immune systems. Laboratory and some animal studies have shown that vitamin C can enhance the proliferation and function of lymphocytes and phagocytes, and may help reduce inflammatory responses. In clinical settings, vitamin C supplementation has been observed to potentially reduce the duration and severity of common cold symptoms (caused by rhinoviruses and coronaviruses), especially in individuals under physical stress or with marginal vitamin C status. However, systematic reviews and meta-analyses, including those from the Cochrane Collaboration, have concluded that vitamin C supplementation does not significantly reduce the incidence of viral infections in the general population, but may provide modest benefits in reducing symptom duration and severity.
There has been renewed interest in vitamin C for severe viral infections like influenza and COVID-19. Early small studies and anecdotal reports suggested possible benefits, but larger randomized controlled trials have not consistently shown a significant therapeutic effect. Overall, while there is some scientific rationale and modest evidence for vitamin C in supporting immune function and possibly reducing the severity or duration of mild viral infections, the evidence does not robustly support vitamin C as a primary treatment for viral infections.
Other ingredients used for Infection (viral)
2'-FucosyllactoseAbies spectabilis
Acemannan
Agarikon Mushroom
Agastache
Agave
AHCC
Ajoene
Alchornea
Alkylglycerols
Alliin
Allium tuberosum
alpha-pinene
Alstonia scholaris
Amor seco
anamu
Andrographis
andrographolide
apple cider vinegar
arabinogalactan
Artepillin C
Asarum heterotropoides
Asarum sieboldii
aucubin
Aureobasidium pullulans
babchi
Baccharis dracunculifolia
baicalin
Baphicacanthus cusia
barberry
Bauhinia
bee propolis
Belamcanda
berberine
beta-glucan
betel
betulinic acid
black cumin
Blepharis
boneset
Brazilian peppertree
burdock
calamus
Campsiandra angustifolia
carvacrol
cassia bark
casticin
cat's claw
Centipeda
Cistus
Coin-leaf desmodium
Coptis chinensis
coriolus mushroom
curcumin
cuspidatum root
Cymbidium goeringii
diallyl disulfide (DADS)
dialyzable leukocyte extract
Echinacea
echinacea purpurea
elderberry
eucalyptus
European Elder
fernbush
Flueggea suffruticosa
fucoidan
galangin
Gallesia
geranium
ginger
Globulins
Glucan peptides
golden shower tree
goldenseal
Graviola
honeysuckle
Houttuynia
Humic acid
Hypericin
immunoglobin G
Immunoglobulin G
iodine
Ivy
Java brucea
Kachnar
knotgrass
Labdanum
Lactobacillus paracasei
Lactococcus rhamnosus
Lactoferrin
Lactoperoxidase
Lapachol
lauric acid
Lentinan
lichen
licorice root
liverwort
Lomatium
mangosteen
mangostin
Marsh Tea
Matapalo Tree
Microtea debilis
Milkweed
Monolaurin
Mountain horopito
Myrobalan
Naphthoquinones
oriental arborvitae
pau d'arco
Pelargonium
Phellodendron
phlorotannins
Phragmites
Piper retrofractum
pistacia integerrima gall
polysaccharides
Premna
Quebracho
ravinsara
reishi mushroom
Rhabdosia rubescens
Sambucus nigra
Sandalwood
Sanguisorba
sarsaparilla
selenium
Shikimic Acid
Shikonin
Simaruba
Smoketree
spirulina
Sulfated polysaccharide
sweet wormwood
Swertia
Tannins
Terpinen-4-ol
Thiosulfinate
Thuja
Trametes
Turkey tail mushroom
turmeric
Tylophorine
Verbascoside
Viscum coloratum
vitamin A
vitamin C
vitamin D
vitamin D3
Xanthoparmelia
Xanthorrhizol
Yellow root
Yerba santa
Zinc
Zingerone
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
