Evidence supporting the use of: Vitamin D
For the health condition: Heart (weakness)

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Synopsis

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

Vitamin D has gained notable attention in recent years for its possible role in cardiovascular health, including the management and prevention of "heart weakness" (a non-technical term often referring to heart failure or reduced cardiac function). Several observational studies have identified that low serum vitamin D levels are associated with an increased risk of cardiovascular diseases, including heart failure, hypertension, and coronary artery disease. Vitamin D receptors are present in cardiac muscle and vascular endothelium, supporting a plausible biological mechanism: vitamin D may influence cardiac contractility, modulate inflammation, and regulate the renin-angiotensin system—all relevant to heart function.

However, the evidence from randomized controlled trials (RCTs) regarding vitamin D supplementation for the treatment or prevention of heart failure is mixed. Some studies and meta-analyses have found modest improvements in cardiac function or reductions in hospitalization rates for heart failure patients with vitamin D deficiency, while others have found no significant benefit. Notably, the 2019 VITAL trial (and similar large RCTs) did not show a reduction in major cardiovascular events with routine vitamin D supplementation in the general population.

In summary, while there is scientific interest and some supportive observational and experimental evidence linking vitamin D status to heart health, the quality and consistency of interventional evidence supporting vitamin D supplementation specifically for heart weakness are moderate at best. Current guidelines recommend correcting vitamin D deficiency for overall health, but not specifically for treating heart failure except in deficient individuals.

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Other health conditions supported by vitamin D

Acne
Allergies (food)
Allergies (respiratory)
Alzheimer's Disease
Amenorrhea
Anemia
Anorexia
Apathy
Arrhythmia
Arteriosclerosis
Arthritis
Asthma
Autism
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Body Building
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Calcium Deficiency
Cancer (natural therapy for)
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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
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Numbness
Nursing
Obsessive Compulsive Disorder
Oral Surgery
Osteoporosis
Pain (general remedies for)
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Parkinson's Disease
Peripheral Neuropathy
PMS (general)
PMS Type D
PMS Type H
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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