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

hormonal

Also known as: 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

Condition	Grade	Studies	Participants
PCOS-Related Weight Management	B	12	800	View →
Obesity	B	11	947	View →
Menopause-Related Weight Gain	C	6	500	View →

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)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Ashwagandha DHEA Maca

Quick Facts

Dosage: 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
Forms: capsule softgel liquid drops tablet gummy
Natural Sources: Sunlight, Fatty fish (salmon, mackerel), Egg yolks, Fortified milk, Mushrooms (UV-exposed)
Upper Limit: 4,000 IU/day (100 mcg); higher doses under medical supervision
Best Time: With a meal containing fat for absorption; morning preferred

Evidence Summary

PCOS-Related Weight Management B

Obesity B

Menopause-Related Weight Gain C

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.