Evidence supporting the use of: Vitamin D
For the health condition: Knees (weak)

Links: Go back one page, Tool main page, Ingredients list, Health conditions list, Body systems list

Synopsis

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

Vitamin D is supported by scientific evidence for its role in musculoskeletal health, including the maintenance of strong bones and muscles, which are relevant to knee function and weakness. Vitamin D facilitates calcium absorption in the gut and maintains adequate serum calcium and phosphate concentrations, enabling normal bone mineralization. Deficiency in vitamin D can lead to osteomalacia in adults, a condition marked by weak bones, muscle weakness, and joint pain, including knee discomfort and instability. Numerous observational studies have linked low vitamin D levels with decreased muscle strength and increased risk of falls in older adults, which can directly impact knee stability and function. Additionally, randomized controlled trials have shown that vitamin D supplementation improves muscle strength and physical performance, especially in those who are deficient.

However, while vitamin D is clearly important for overall bone and muscle health, the evidence for its direct efficacy in treating or specifically strengthening "weak knees" in the absence of deficiency is moderate. Supplementation is most beneficial in individuals who are deficient or at risk for deficiency (e.g., elderly, those with limited sun exposure). For people with normal vitamin D levels, additional supplementation has not consistently shown significant benefit for joint pain or knee strength. Thus, vitamin D is scientifically justified for use in cases of deficiency or risk of deficiency to support musculoskeletal health, including the knees, but is not a targeted treatment for knee weakness in all populations.

More about vitamin D
More about Knees (weak)

Other ingredients used for Knees (weak)

collagen
turmeric
glucosamine
vitamin C
vitamin D
fern

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