Evidence supporting the use of: Vitamin D
For the health condition: Infection

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Vitamin D has been studied for its role in supporting the immune system and potentially helping to prevent or treat infections. The scientific rationale arises from vitamin D’s function in modulating both innate and adaptive immune responses. Immune cells such as macrophages and dendritic cells express vitamin D receptors and are able to convert circulating 25(OH)D to the active form, calcitriol, which then influences the expression of antimicrobial peptides like cathelicidin and defensins. These peptides enhance the body’s ability to destroy invading pathogens, especially in the respiratory tract.

Epidemiological studies have found associations between low vitamin D levels and increased susceptibility to infections such as influenza, pneumonia, and respiratory tract infections. Several randomized controlled trials (RCTs) and meta-analyses have investigated whether vitamin D supplementation reduces infection risk. A 2017 meta-analysis published in BMJ found that vitamin D supplementation modestly reduced the risk of acute respiratory infections, particularly in individuals with marked vitamin D deficiency. However, results across studies are mixed, with some trials showing no significant benefit.

While vitamin D is not a treatment for active infection, maintaining adequate levels may help reduce the risk or severity of infections. The evidence is strongest for respiratory tract infections, while data for other infections are less robust. Thus, scientific evidence supports a preventive role for vitamin D in certain infections, but further research is needed to clarify optimal dosing, target populations, and effects on specific pathogens.

More about vitamin D
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Other ingredients used for Infection

2'-Fucosyllactose
ajoene
allspice
alpha-pinene
green chiretta
annatto
arabinogalactan
astragalus
bacillus clausii
bayberry
bearberry
myrobalan
Beta-Glucan
betel
bifidobacterium infantis
bisabolol
black pepper
black walnut
burdock
caprylic acid
cassia bark
cat's claw
chaga mushroom
Coptis chinensis
turmeric
cuspidatum root
echinacea purpurea
elderberry
ginger
goldenseal
heartwood
immunoglobin G
Indian gum arabic tree
iodine
L12-myoviridae
lactobacillus brevis
lactococcus lactis
lactoferrin
lactoperoxidase
lauric acid
LH01-myoviridae
licorice root
LL12-myoviridae
LL5-siphoviridae
mangosteen
monolaurin
moringa
n-acetyl-cysteine (NAC)
oregon grape
protein
purified silver
reishi mushroom
schizonepeta
scrophularia root
selenium
spirulina
streptococcus thermophilus
sweet wormwood
T4D-myoviridae
turkey tail mushroom
vitamin A
vitamin C
vitamin D
vitamin D3
wasabia japonica
zinc
sarsaparilla
yellow root
boneset
hyssop
cardamom
neem tree
malabar nut
hedychium spicatum
pistacia integerrima gall
paederia foetida
blackboard tree
caesalpinia crista
rubia cordifolia
swertia
bee pollen
chaff flower
pau d'arco
prickly ash
myrrh
yerba santa
amber
flowering quince
fern
oriental arborvitae
birch
eucalyptus
polyporus
white oak
sea salt
3-Phenyllactic Acid
Avens
Agarikon Mushroom
Apple Cider Vinegar
Agastache
Aquilegia viridiflora
Alpha-Humulene
Alpha-terpineol
Ardisia
Angelica
acacia
Agave
Allicin
Anamu
Abrus
Alchornea
Asarum heterotropoides
Artesunate
AHCC
Aucubin
Andrographolide
Aerva lanata
American Liverleaf
Asam gelugor
Aureobasidium pullulans
Andrographis
Alsonia scholaris
Ampelopsis
Allyl Sulfide
Acemannan
Alkylglycerols
Alliin
Abuta
Alstonia macrophylla
Asarum sieboldii
Alantolactone
Animal protein
Bee Propolis
Bifidobacterium
Babchi
Baphicacanthus cusia
Blackthorn
Blepharis
Balsam
Beef liver
Baccharis dracunculifolia
Barleria
Berberis (unspecified)
Bisabolene
Basidiomycota
Baccharoides anthelmintica
Backhousia citriodora
Banyan
Barbary matrimony vine
Black Nightshade
Borassus Palm
Borassus aethiopum
Bitter principals
Bacteria
Black root
Bupleurum
Bacillus
benzyl isothiocyanate
Belamcanda
Bergenia
Bignay
Croton seeds
Chervil
Clerodendrum trichotomum
Colloidal Silver
coconut oil
Coriolus mushroom
Cactus
Carvacrol
Cymbidium goeringii
Cajuput
Chlorophytum
Catechu
Celandine
Citral
Centipeda
Cistus
Corktree
Cubeb
Cinchona
Chirata
Chaenomeles lagenaria
Calamus
Coin-leaf desmodium
Cyanthillium cinereum
Cynodon dactylon
Cassava
Chiococca alba
Cocklebur
Celastrus
Copaiba Oil
Celosia
Clerodendrum indicum
Dense Fruit Dittany
Dialyzable Leukocyte Extract
Deoxyandrographolides
Dichrostachys glomerata
European Elder
English Horsemint
Echinacea
Echinodorus
Elephant's Head
Euphorbia
Embelia
Eugenol
Glucanase
Milk Protein
Sandalwood
Sumac

Other health conditions supported by vitamin D

Acne
Allergies (food)
Allergies (respiratory)
Alzheimer's Disease
Amenorrhea
Anemia
Anorexia
Apathy
Arrhythmia
Arteriosclerosis
Arthritis
Asthma
Autism
Autoimmune Disorders
Backache
Birth Defects (prevention)
Body Building
Broken Bones
Calcium Deficiency
Cancer (natural therapy for)
Cancer (prevention)
Cancer Treatment (reducing side effects)
Cardiovascular Disease
Celiac Disease
Chronic Obstructive Pulmonary Disorder
Colds (antiviral)
Colds (general)
Colds (prevention)
Colds (with fever)
Concentration (poor)
Concussions
Confusion
Congestive Heart Failure
Contagious Diseases
Convalescence
Convulsions
Cramps (menstrual)
Cramps and Spasms
Crohn's Disease
Cystic Breast Disease
Cystic Fibrosis
Dandruff
Debility
Dementia
Depression
Dermatitis
Diabetes
Diabetic Retinopathy
Erectile Dysfunction
Estrogen (low)
Fatigue
Fibroids (uterine)
Fibromyalgia Syndrome
Fibrosis
Grave's Disease
Grief and Sadness
Hair (loss or thinning)
Hair Care (general)
Hashimoto's Disease
Headache (cluster)
Heart (weakness)
Hypertension
Hypothyroid
Infection
Infection (bacterial)
Infection (viral)
Infertility
Inflammation
Inflammatory Bowel Disorders
Influenza
Injuries
Irritable Bowel Syndrome
Itching
Knees (weak)
Leaky Gut Syndrome
Leprosy
Lesions
Leukemia
Lou Gehrig's Disease
Lupus
Lymphoma
Melanoma
Memory and Brain Function
Menopause
Menstrual Irregularity
Mental Illness
Metabolic Syndrome
Migraine
Miscarriage (prevention)
Mood Swings
Multiple Sclerosis
Muscle Tone (lack of)
Muscular Dystrophy
Myasthenia Gravis
Nephritis
Nerve Damage
Nervous Exhaustion
Numbness
Nursing
Obsessive Compulsive Disorder
Oral Surgery
Osteoporosis
Pain (general remedies for)
Pancreatitis
Paralysis
Parkinson's Disease
Peripheral Neuropathy
PMS (general)
PMS Type D
PMS Type H
PMS Type P
PMS Type S
Pneumonia
Polyps
Post Partum Depression
Post Partum Weakness
Pregnancy (herbs and supplements for)
Progesterone (low)
Prostatitis
Psoriasis
Rheumatoid Arthritis
Schizophrenia
Sciatica
Seasonal Affective Disorder
Senility
Tuberculosis