What is the recommended dosage for Vitamin D?

General: 600-800 IU/day; Weight Management: 2,000-4,000 IU/day (targeting 25(OH)D >30 ng/mL); Deficiency Correction: 5,000-10,000 IU/day for 8-12 weeks under medical supervision

What are the side effects of Vitamin D?

Potential side effects include: Hypercalcemia (at very high doses), Nausea, Kidney stones (at excessive doses).

What is vitamin D and how may it relate to weight management?

Vitamin D is a fat-soluble vitamin essential for calcium absorption and immune function. Observational studies have linked low vitamin D levels with higher body mass index. Some clinical trials suggest that correcting vitamin D deficiency may modestly support weight management efforts, though evidence is not conclusive.

What dosage of vitamin D has been studied for weight management?

Clinical trials have used 1,000–4,000 IU of vitamin D3 per day for weight-related outcomes. The Recommended Dietary Allowance is 600–800 IU daily, though many researchers suggest higher intakes. Dosing should ideally be guided by blood level testing (25-hydroxyvitamin D).

What are the potential side effects of vitamin D supplements?

Vitamin D is generally safe at recommended doses. Excessive intake (above 10,000 IU daily over extended periods) can lead to hypercalcemia, causing nausea, weakness, and kidney damage. Vitamin D3 is preferred over D2 for supplementation due to better bioavailability.

Vitamin D
Vitamin D

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يُعرف أيضاً بـ: Cholecalciferol (D3), Ergocalciferol (D2), Calciferol

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About

A fat-soluble vitamin with receptors in adipose tissue, skeletal muscle, and the pancreas. Mendelian randomization studies confirm a causal association between low vitamin D levels and higher BMI, and meta-analyses support supplementation for metabolic health in deficient individuals.

How It Works

Vitamin D receptors are expressed in adipose tissue, skeletal muscle, and the pancreas. Adequate vitamin D status supports insulin sensitivity, leptin signaling, and calcium-mediated fat oxidation. Deficiency (25(OH)D <20 ng/mL) is independently associated with obesity, insulin resistance, and increased visceral fat — potentially through impaired adipocyte differentiation and increased parathyroid hormone (PTH).

Evidence For Conditions

الحالة	التقييم	الدراسات	المشاركون
PCOS-Related Weight Management	B	12	800	عرض →
Obesity	B	11	947	عرض →
Menopause-Related Weight Gain	C	6	500	عرض →

Side Effects

Hypercalcemia (at very high doses)
Nausea
Kidney stones (at excessive doses)

Drug & Supplement Interactions

Statins (may increase statin levels)
Thiazide diuretics (increased calcium risk)
Corticosteroids (impair vitamin D metabolism)
Orlistat (reduced absorption)

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Related Ingredients

Ashwagandha Maca DHEA

حقائق سريعة

الجرعة: General: 600-800 IU/day; Weight_Management: 2,000-4,000 IU/day (targeting 25(OH)D >30 ng/mL); Deficiency_Correction: 5,000-10,000 IU/day for 8-12 weeks under medical supervision
الأشكال الدوائية: capsule softgel liquid drops tablet gummy
المصادر الطبيعية: Sunlight, Fatty fish (salmon, mackerel), Egg yolks, Fortified milk, Mushrooms (UV-exposed)
الحد الأعلى: 4,000 IU/day (100 mcg); higher doses under medical supervision
أفضل وقت: With a meal containing fat for absorption; morning preferred

ملخص الأدلة

PCOS-Related Weight Management B

Obesity B

Menopause-Related Weight Gain C

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